Static 'Initialize' factory method on structs with cbSize fields

Instead of:

var cursorInfo = new CURSORINFO { cbSize = (uint)Marshal.SizeOf(typeof(CURSORINFO)) };

What if we could write:

var cursorInfo = CURSORINFO.Initialize();

And Initialize would use either sizeof or a constant calculated at compile time whenever possible rather than calling Marshal.SizeOf?

(Allowing structs to have default constructors is being discussed for future C# versions.)

BITMAPINFOHEADER has biSize rather than cbSize.

Start with the issue examples for CURSORINFO and BITMAPINFOHEADER and inspect the repository to find where these supporting structs are generated. Determine the intended generated Initialize API and how compile-time size calculation would apply. Done means the proposed behavior is implemented consistently for cbSize and biSize cases, with coverage for the generated results.