[Refactor - Breaking] Refactor cube operations with better names & Support subgroup operations

[nathanielsimard]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 67.25572% with 315 lines in your changes are missing coverage. Please review.

Project coverage is 86.21%. Comparing base (de0b49e) to head (4ec6043).
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/burn-jit/src/fusion/tracing/builder.rs	0.00%	54 Missing ⚠️
crates/burn-cube/src/frontend/subcube.rs	47.52%	53 Missing ⚠️
crates/burn-cube/src/ir/variable.rs	30.00%	49 Missing ⚠️
crates/burn-cube/src/runtime_tests/subcube.rs	63.11%	45 Missing ⚠️
crates/burn-cube/src/ir/vectorization.rs	0.00%	41 Missing ⚠️
crates/burn-wgpu/src/compiler/wgsl/compiler.rs	43.54%	35 Missing ⚠️
crates/burn-wgpu/src/compiler/wgsl/subgroup.rs	37.50%	15 Missing ⚠️
crates/burn-wgpu/src/runtime.rs	58.33%	5 Missing ⚠️
crates/burn-cube/src/frontend/synchronization.rs	0.00%	4 Missing ⚠️
crates/burn-cube/src/runtime.rs	0.00%	3 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1839      +/-   ##
==========================================
- Coverage   86.41%   86.21%   -0.21%     
==========================================
  Files         760      765       +5     
  Lines       87841    88339     +498     
==========================================
+ Hits        75910    76163     +253     
- Misses      11931    12176     +245     

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