Dynamic threadgroup memory

[christiangnrd]

Surprisingly it's somewhat functional. Only macOS 15+ since the global dynamic threadgroup memory is not available before then. This isn't the only way to get this dynamic threadgroup memory, but I tried this approach as my first attempt since it seemed the most similar to how static threadgroup memory is implemented.

The Metal interface takes an Integer or a Tuple of the size of the allocation, which is then aligned to the next multiple of 16.

Kernels silently fail under shader validation (which are caught in the tests since the output doesn't match expected results.

TODO:

• Validate total threadgroup memory used
• Make work under shader validation

Close #701

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.03%. Comparing base (edeab68) to head (c6bf0b4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #750      +/-   ##
==========================================
+ Coverage   78.55%   82.03%   +3.47%     
==========================================
  Files          67       64       -3     
  Lines        3605     3590      -15     
==========================================
+ Hits         2832     2945     +113     
+ Misses        773      645     -128     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.