Track CCW info for '[ReadOnly]Dictionary[Key|Value]Collection<TKey, TValue>' typs in 'cswinrtgen'

[Sergio0694]

Title. This results in the following additional instantiations in WinRT.Interop.dll (there's more):

[Copilot]

Pull request overview

This PR enhances the WinRT interop generator to track CCW (COM Callable Wrapper) information for dictionary collection types (DictionaryKeyCollection, DictionaryValueCollection, ReadOnlyDictionaryKeyCollection, and ReadOnlyDictionaryValueCollection). The changes ensure these collection types are properly instantiated in WinRT.Interop.dll when their parent dictionary types are discovered, enabling correct marshalling to native code.

Key changes:

• Refactored generic interface type tracking from extension methods to a dedicated method in InteropTypeDiscovery.Generics.cs
• Added automatic tracking of dictionary key/value collection types when discovering IDictionary<TKey, TValue> and IReadOnlyDictionary<TKey, TValue> instantiations
• Enhanced documentation in dictionary collection classes to clarify the concrete types returned by Keys and Values properties

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
WindowsRuntimeReadOnlyDictionary{TKey, TValue}.cs	Added XML documentation remarks clarifying the concrete types returned by Keys and Values properties
WindowsRuntimeObservableMap{TKey, TValue}.cs	Added XML documentation remarks for dictionary collection properties with inherited documentation for interface implementations
WindowsRuntimeDictionary{TKey, TValue}.cs	Added XML documentation remarks for dictionary collection properties with inherited documentation for interface implementations
InteropGenerator.Discover.cs	Added module parameter to TryTrackExposedUserDefinedType call to support enhanced type discovery
InteropGeneratorDiscoveryStateExtensions.cs	Deleted file - functionality moved to InteropTypeDiscovery.Generics.cs
InteropTypeDiscovery.cs	Added module parameter to TryTrackExposedUserDefinedType method signature
InteropTypeDiscovery.Generics.cs	Refactored generic interface tracking into dedicated method with automatic tracking of dictionary collection types when parent dictionary types are discovered

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