Provide RAII helpers for COM pointers

[0x5bfa]

Is your feature request related to a problem? Please describe.

When I want to use a COM interface pointer in the non-marshal mode with CsWin32, you have to IUnknown::Release it manually. However, in C++, it's normal to use the RAII helpers, such as ComPtr, ComHeapPtr, etc.

Describe the solution you'd like

Generate RAII helpers for COM, such as ComPtr, ComHeapPtr, etc.

Describe alternatives you've considered

Do not implement this and let users of CsWin32 manually release COM pointers.

Additional context

Here's some sample implementations.

• ComPtr:
  • https://github.com/terrafx/terrafx.interop.windows/blob/HEAD/sources/Interop/Windows/ComPtr%601.cs
• ComHeapPtr:
  • https://github.com/0x5bfa/Files/blob/93b5b34e97cf59aca62574aca8e065f1b08efdb7/src/Files.App.CsWin32/ComHeapPtr%601.cs