chore: Create 0.10.0-migration.md

Author: makspll

release-notes/0.10.0-migration.md

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+# Migrating from 0.9 to 0.10
+
+## Change in script re-load behavior https://github.com/makspll/bevy_mod_scripting/pull/345
+
+Scripts now retain state on a re-load. This means any globals created in a script should be re-computed when it is loaded using `on_script_loaded`
+
+## `ScriptContexts` resource removed https://github.com/makspll/bevy_mod_scripting/pull/350
+
+Change all references from `ScriptContexts.contexts` to `Scripts<T>.scripts.context`
+
+Language implementations must provide an internal mutability mechanism for their runtimes, and change &mut references to & on references to them in handlers
+
+## Removal of some internal macros https://github.com/makspll/bevy_mod_scripting/pull/367
+
+A number of internal macros was made private as part of an effort to clean up BMS imports.
+
+If you were using these you will need to re-implement those yourself.
+
+## Changes to `GetTypeDependencies` trait https://github.com/makspll/bevy_mod_scripting/pull/369
+
+- Any types which you implemented `GetTypeDependencies` for manually, will need to specify an underlying type, for non-generic types this will just be Self, for types which have recursive registrations, this will be `Self<T1::Underlying, T2::Underlying...>` etc
+- You can use the derive macro to make this easier instead
+
+## Addition of global type cache
+
+You should replace all your `world.get_type_by_name("MyType")` calls with `types.MyType` etc.
+get type by name was not removed but it might be deprecated in the future.
+