KCL: New KCL type formatter and parser (#8774)

The "clean up type string" logic [here](https://github.com/KittyCAD/modeling-app/blob/achalmers/array-of-unions/rust/kcl-lib/src/docs/gen_std_tests.rs#L517) is a bit complicated, and it doesn't support arrays of unions. IMO it's difficult to do both formatting and parsing of KCL types in the same function. A better approach would be to recursively parse the type into a tree structure (where arrays have a subtype, and unions have multiple subtypes), then format that tree.

This PR:

 - Adds unit tests for the cleanup_type_string function, in the first commit.
 - Adds a new proper recursive parser for KCL type strings (parses them into a tree)
 - Changes the KCL type formatter `cleanup_type_string` to use this parsed tree, rather than adhoc string processing. This includes changes to the unit tests added in the first commit.
 - Updates all the docs 

This has some very slight changes to the resulting Markdown, which should be easy to see. They're basically change how arrays are nested in their markdown links. 

As a side-effect this should nicely render arrays of unions in types, such as the ones Serena's adding in her [PR](#8661).

Old: the Markdown link contains a `[string]` in its text
New: the Markdown link is just around `string`, and the surrounding array braces are outside the link.

Author: adamchalmers

docs/kcl-std/functions/std-appearance-hexString.md

@@ -17,7 +17,7 @@ appearance::hexString(@rgb: [number(_); 3]): string
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `rgb` | [`[number(_); 3]`](/docs/kcl-std/types/std-types-number) | The red, blue and green components of the color. Must be between 0 and 255. | Yes |
+| `rgb` | [[`number(_)`](/docs/kcl-std/types/std-types-number); 3] | The red, blue and green components of the color. Must be between 0 and 255. | Yes |
 
 ### Returns
 

docs/kcl-std/functions/std-array-concat.md

@@ -20,12 +20,12 @@ Returns a new array with the all the elements of the first array followed by all
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any]`](/docs/kcl-std/types/std-types-any) | The array of starting elements. | Yes |
-| `items` | [`[any]`](/docs/kcl-std/types/std-types-any) | The array of ending elements. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any)] | The array of starting elements. | Yes |
+| `items` | [[`any`](/docs/kcl-std/types/std-types-any)] | The array of ending elements. | Yes |
 
 ### Returns
 
-[`[any]`](/docs/kcl-std/types/std-types-any)
+[[`any`](/docs/kcl-std/types/std-types-any)]
 
 
 ### Examples

docs/kcl-std/functions/std-array-count.md

@@ -17,7 +17,7 @@ count(@array: [any]): number
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any]`](/docs/kcl-std/types/std-types-any) | The array whose length will be returned. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any)] | The array whose length will be returned. | Yes |
 
 ### Returns
 

docs/kcl-std/functions/std-array-map.md

@@ -21,12 +21,12 @@ Given a list like `[a, b, c]`, and a function like `f`, returns
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any]`](/docs/kcl-std/types/std-types-any) | Input array. The output array is this input array, but every element has had the function `f` run on it. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any)] | Input array. The output array is this input array, but every element has had the function `f` run on it. | Yes |
 | `f` | [`fn(any): any`](/docs/kcl-std/types/std-types-fn) | A function. The output array is just the input array, but `f` has been run on every item. | Yes |
 
 ### Returns
 
-[`[any]`](/docs/kcl-std/types/std-types-any)
+[[`any`](/docs/kcl-std/types/std-types-any)]
 
 
 ### Examples

docs/kcl-std/functions/std-array-pop.md

@@ -17,11 +17,11 @@ Returns a new array with the last element removed.
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any; 1+]`](/docs/kcl-std/types/std-types-any) | The array to pop from. Must not be empty. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any); 1+] | The array to pop from. Must not be empty. | Yes |
 
 ### Returns
 
-[`[any]`](/docs/kcl-std/types/std-types-any)
+[[`any`](/docs/kcl-std/types/std-types-any)]
 
 
 ### Examples

docs/kcl-std/functions/std-array-push.md

@@ -20,12 +20,12 @@ Returns a new array with the element appended.
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any]`](/docs/kcl-std/types/std-types-any) | The array which you're adding a new item to. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any)] | The array which you're adding a new item to. | Yes |
 | `item` | [`any`](/docs/kcl-std/types/std-types-any) | The new item to add to the array | Yes |
 
 ### Returns
 
-[`[any; 1+]`](/docs/kcl-std/types/std-types-any)
+[[`any`](/docs/kcl-std/types/std-types-any); 1+]
 
 
 ### Examples

docs/kcl-std/functions/std-array-reduce.md

@@ -21,7 +21,7 @@ reduce(
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `array` | [`[any]`](/docs/kcl-std/types/std-types-any) | Each element of this array gets run through the function `f`, combined with the previous output from `f`, and then used for the next run. | Yes |
+| `array` | [[`any`](/docs/kcl-std/types/std-types-any)] | Each element of this array gets run through the function `f`, combined with the previous output from `f`, and then used for the next run. | Yes |
 | `initial` | [`any`](/docs/kcl-std/types/std-types-any) | The first time `f` is run, it will be called with the first item of `array` and this initial starting value. | Yes |
 | `f` | [`fn(any, accum: any): any`](/docs/kcl-std/types/std-types-fn) | Run once per item in the input `array`. This function takes an item from the array, and the previous output from `f` (or `initial` on the very first run). The final time `f` is run, its output is returned as the final output from `reduce`. | Yes |
 

docs/kcl-std/functions/std-gdt-flatness.md

@@ -27,7 +27,7 @@ gdt::flatness(
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `faces` | [`[TaggedFace; 1+]`](/docs/kcl-std/types/std-types-TaggedFace) | The faces to be annotated. | Yes |
+| `faces` | [[`TaggedFace`](/docs/kcl-std/types/std-types-TaggedFace); 1+] | The faces to be annotated. | Yes |
 | `tolerance` | [`number(Length)`](/docs/kcl-std/types/std-types-number) | The amount of deviation from a perfect plane that is acceptable. | Yes |
 | `precision` | [`number(_)`](/docs/kcl-std/types/std-types-number) | The number of decimal places to display. The default is `3`. Must be greater than or equal to `0` and less than or equal to `9`. | No |
 | `framePosition` | [`Point2d`](/docs/kcl-std/types/std-types-Point2d) | The position of the feature control frame relative to the leader arrow. The default is `[100mm, 100mm]`. | No |
@@ -37,7 +37,7 @@ gdt::flatness(
 
 ### Returns
 
-[`[GdtAnnotation; 1+]`](/docs/kcl-std/types/std-types-GdtAnnotation)
+[[`GdtAnnotation`](/docs/kcl-std/types/std-types-GdtAnnotation); 1+]
 
 
 ### Examples

docs/kcl-std/functions/std-hole-hole.md

@@ -31,7 +31,7 @@ hole::hole(
 | `holeBottom` |  | Define bottom feature of the hole. E.g. drilled or flat. | Yes |
 | `holeBody` |  | Define the main length of the hole. E.g. a blind distance. | Yes |
 | `holeType` |  | Define the top feature of the hole. E.g. countersink, counterbore, simple. | Yes |
-| `cutAt` | [`[number(Length); 2]`](/docs/kcl-std/types/std-types-number) | Where to place the cut on the given face of the solid. Given as absolute coordinates in the global scene. | Yes |
+| `cutAt` | [[`number(Length)`](/docs/kcl-std/types/std-types-number); 2] | Where to place the cut on the given face of the solid. Given as absolute coordinates in the global scene. | Yes |
 
 
 ### Examples

docs/kcl-std/functions/std-hole-holes.md

@@ -31,7 +31,7 @@ hole::holes(
 | `holeBottom` |  | Define bottom feature of the hole. E.g. drilled or flat. | Yes |
 | `holeBody` |  | Define the main length of the hole. E.g. a blind distance. | Yes |
 | `holeType` |  | Define the top feature of the hole. E.g. countersink, counterbore, simple. | Yes |
-| `cutsAt` | `[[number(Length); 2]]` | Where to place the holes, given as absolute coordinates in the global scene. | Yes |
+| `cutsAt` | [[[`number(Length)`](/docs/kcl-std/types/std-types-number); 2]] | Where to place the holes, given as absolute coordinates in the global scene. | Yes |