* Add IAsyncDisposable support to mock generators
Extend both GenerateMock and GenerateCapturingMock to support interfaces
that inherit IAsyncDisposable, mirroring the existing IDisposable pattern.
Changes:
- Add IAsyncDisposable to KnownInheritance type
- Detect IAsyncDisposable inheritance in interface parsing
- Generate DisposeAsync field with ValueTask return type
- Initialize DisposeAsync with completed ValueTask() in Empty mock
- Implement System.IAsyncDisposable interface explicitly
- Support interfaces inheriting both IDisposable and IAsyncDisposable
Test cases added:
- TypeWithAsyncDisposable: interface with only IAsyncDisposable
- TypeWithBothDisposables: interface with both disposal interfaces
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