refactor: Move from CubeOption to Option

[wingertge]

Pull Request Template

Checklist

• Confirmed that cargo run-checks command has been executed.
• Made sure the book is up to date with changes in this PR.

Related Issues/PRs

Requires
tracel-ai/cubecl#1194
tracel-ai/cubek#95

Changes

Migrates to refactor that removes CubeOption in favor of Option, and uses some of the new methods to clean up the code.

Testing

All tests pass.

[wingertge]

Pretty sure that mac CI error is unrelated to this PR, likely related to one of the attention-related commits added since the last cubek update

[codecov]

Codecov Report

❌ Patch coverage is 0% with 71 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.20%. Comparing base (a50709b) to head (46d5793).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...cubecl-fusion/src/optim/reduce_broadcasted/unit.rs	0.00%	19 Missing ⚠️
...-cubecl/src/kernel/conv/deform_conv_transpose2d.rs	0.00%	14 Missing ⚠️
crates/burn-cubecl-fusion/src/optim/matmul/args.rs	0.00%	9 Missing ⚠️
...rates/burn-cubecl/src/kernel/conv/deform_conv2d.rs	0.00%	8 Missing ⚠️
...urn-cubecl-fusion/src/optim/matmul/optimization.rs	0.00%	7 Missing ⚠️
...-cubecl/src/kernel/conv/conv_transpose2d/col2im.rs	0.00%	3 Missing ⚠️
...c/kernel/conv/conv_transpose2d/transpose_direct.rs	0.00%	3 Missing ⚠️
...es/burn-cubecl/src/kernel/conv/conv_transpose3d.rs	0.00%	3 Missing ⚠️
crates/burn-cubecl/src/kernel/conv/direct.rs	0.00%	3 Missing ⚠️
...becl-fusion/src/optim/reduce_broadcasted/launch.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4543      +/-   ##
==========================================
+ Coverage   61.12%   61.20%   +0.07%     
==========================================
  Files        1086     1086              
  Lines      140411   140406       -5     
==========================================
+ Hits        85831    85936     +105     
+ Misses      54580    54470     -110     

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[laggui]

Yeah I think tracel-ai/cubek@b857e33 broke the test.

Should not be a blocker for this PR, changes LGTM.