Interop related work to enable WinForms trimming

[LakshanF]

This issue tracks the interop work related WinForms trimming

• [Tracking] CsWin32 API Change/Add Requests #7468
• ComWrapper needs to return vtable based on types, not interfaces #8291
• Clean up and document existing behavior in COM classes #8292
• Broken custom IDataObject implementations #4555
• Need to fully implement object to VARIANT. #8596
• Consider providing IDispatch data with trimming/AOT #9783
• Implement StandardDispatch for AccessibleObject #9784
• Lazily populate ClassPropertyDispatchAdapter #9785
• Validate COM TypeDescriptor enum behavior with trimming/AOT #9787
• Make AccessibleObject trimmable #9795
• Need to handle incoming IDataObject pointers for AOT #9805