WGPU: matmul vec4

[louisfd]

Use the best matmul by default

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0ab611b) 85.31% compared to head (5b3bfdb) 85.26%.

❗ Current head 5b3bfdb differs from pull request most recent head 3a47b19. Consider uploading reports for the commit 3a47b19 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #897      +/-   ##
==========================================
- Coverage   85.31%   85.26%   -0.06%     
==========================================
  Files         470      470              
  Lines       44585    44585              
==========================================
- Hits        38039    38014      -25     
- Misses       6546     6571      +25     

Files	Coverage Δ
burn-wgpu/src/ops/float_ops.rs	96.42% <100.00%> (ø)

... and 2 files with indirect coverage changes

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