feat(components): add collapse component

[desmondinho]

Description

Add the collapse component to the component library, as it is essential for other components like the Accordion.

Closes #15

What's been done?

1. Added collapse component with the following abilities:

   • Set expanded state
   • The callback when a collapse/expand transition ends

2. Added the GetScrollHeight extension for the ElementReference that invokes JS runtime.

3. Added the getScrollHeight JavaScript script, which is invoked via the extension method mentioned above.

Checklist

• My code follows the project's coding style and guidelines.
• I have included inline docs for my changes, where applicable.
• I have added, updated or removed tests according to my changes.
• All tests are passing.
• There's an open issue for the PR that I am making.

Additional Notes

Some of the tests have not been added due to a lack of knowledge on how to test complex cases like the ones in the OnAfterRenderAsync lifecycle method of the LumexCollapse component. I've left a TODO for the future.

[codecov]

Codecov Report

Attention: Patch coverage is 80.32787% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 97.89%. Comparing base (4e630bb) to head (7727d40).

Files	Patch %	Lines
src/LumexUI/Components/Collapse/LumexCollapse.cs	78.57%	11 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   99.54%   97.89%   -1.65%     
==========================================
  Files          27       28       +1     
  Lines         654      711      +57     
  Branches       43       56      +13     
==========================================
+ Hits          651      696      +45     
- Misses          1       12      +11     
- Partials        2        3       +1     

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