Merge reduce

[maxtremblay]

I import the reduction from cubecl and make them work with autotune.

[codecov]

Codecov Report

Attention: Patch coverage is 76.87500% with 74 lines in your changes missing coverage. Please review.

Project coverage is 82.97%. Comparing base (3990a8a) to head (22bdae7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/burn-jit/src/kernel/reduce/tune.rs	67.53%	50 Missing ⚠️
crates/burn-jit/src/kernel/reduce/base.rs	70.83%	14 Missing ⚠️
crates/burn-jit/src/ops/float_ops.rs	0.00%	7 Missing ⚠️
crates/burn-jit/src/ops/int_ops.rs	71.42%	2 Missing ⚠️
crates/burn-jit/src/tune_key.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2673      +/-   ##
==========================================
+ Coverage   82.62%   82.97%   +0.35%     
==========================================
  Files         843      823      -20     
  Lines      107463   107019     -444     
==========================================
+ Hits        88792    88800       +8     
+ Misses      18671    18219     -452     

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