Feat/fused matmul tune

[nathanielsimard]

Enable fused matmul with autotune.

[codecov]

Codecov Report

Attention: Patch coverage is 95.97523% with 13 lines in your changes missing coverage. Please review.

Project coverage is 83.91%. Comparing base (b33bd24) to head (276db0d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/burn-jit/src/fusion/matmul/optimization.rs	92.03%	9 Missing ⚠️
crates/burn-jit/src/fusion/matmul/tune.rs	95.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2726      +/-   ##
==========================================
+ Coverage   83.59%   83.91%   +0.32%     
==========================================
  Files         819      821       +2     
  Lines      106600   106890     +290     
==========================================
+ Hits        89113    89702     +589     
+ Misses      17487    17188     -299     

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[laggui]

Looks good! Just a comment/question