Implement Element for bool

[laggui]

Checklist

• Confirmed that run-checks all script has been executed.

Related Issues/PRs

Required for #1535 and Data refactor

Changes

Since the traits Zero, One and ToPrimitive from num-traits could not be implemented for bool:

• Added new Zero and One element identities (without Add and Mul requirement) Removed the traits (previously kept for historical reasons)
• Added new ToElement trait (adapted from num_traits::ToPrimitive)

Element is now implemented for bool, which should simplify a couple of things.

[codecov]

Codecov Report

Attention: Patch coverage is 47.34982% with 149 lines in your changes missing coverage. Please review.

Project coverage is 86.02%. Comparing base (5e58ae1) to head (095199d).

Files	Patch %	Lines
crates/burn-tensor/src/tensor/element/cast.rs	43.85%	137 Missing ⚠️
crates/burn-tensor/src/tensor/element/base.rs	47.05%	9 Missing ⚠️
crates/burn-ndarray/src/ops/macros.rs	0.00%	1 Missing ⚠️
crates/burn-tensor/src/tensor/ops/int_tensor.rs	0.00%	1 Missing ⚠️
crates/burn-tensor/src/tensor/ops/tensor.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1878      +/-   ##
==========================================
- Coverage   86.14%   86.02%   -0.12%     
==========================================
  Files         778      779       +1     
  Lines       90827    91064     +237     
==========================================
+ Hits        78245    78342      +97     
- Misses      12582    12722     +140     

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[laggui]

@nathanielsimard Removed One and Zero identities as discussed.

[laggui]

Not sure why clippy failed on that commit specifically, seems unrelated.

/edit: just saw PR #1886 fixes that

[antimora]

LGTM

[antimora]

Will this fix #1535?

[laggui]

Will this fix #1535?

The ops won't be implemented in this PR but with these changes they could be refactored properly.

[nathanielsimard]

LGTM, however I would add num_trait to the NOTICE.md file before merging.