feat(wasm): Add mt and mt+simd, fix harfbuzz for emsdk 3.1.12

[jeromelaban]

Description of Change

Adds explicit support for multi-threaded and SIMD combinations.

Bugs Fixed

• Parts [BUG] wasm-ld: Error : --shared-memory is disallowed by libHarfBuzzSharp.hb-common.o because it was not compiled with 'atomics' or 'bulk-memory' features. #2285, still requires .NET SDK-specific adjustments.
• Fixes incorrect UWP type name for Uno Wasm
• Adds support for software rendering in Browser secure context (Used with threads)
• GL, GLctx and threading fixes (related to WASM: GL object no longer accessible in .net 7 (Skiasharp) dotnet/runtime#76077)

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[mattleibow]

Do all these changes affect both libSkiaSharp and libHarfBuzzSharp?

I can't recall if this did both.

[jeromelaban]

It looks like it does not, I'll make the change there as well.

[mattleibow]

In a separate PR I'll try get wasm tests to run in all these combos.

[VahidN]

Sorry to ask it here. Are you using the last harfbuzz (V 6x)?

[drdmohssine]

I'm still getting the error:
--shared-memory is disallowed by libskia.SkOpts.o because it was not compiled with 'atomics' or 'bulk-memory' features.
is there any fix.