Add tests for CPU binding

[HadrienG2]

One more module towards #110 :)

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 5 of 7 files.

Overall, the semantic diff is 5% smaller than the GitHub diff.

	Filename	Status
❔	.github/workflows/ci.yml	Unsupported file format
❔	Cargo.toml	Unsupported file format
✔️	src/bitmap/mod.rs	Analyzed
✔️	src/cpu/binding.rs	10.64% smaller
✔️	src/ffi/transparent.rs	45.29% smaller
✔️	src/lib.rs	62.04% smaller
✔️	tests/single-threaded.rs	Analyzed

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.85%. Comparing base (4e5fe37) to head (20b3537).

Files	Patch %	Lines
src/cpu/binding.rs	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   73.07%   75.85%   +2.77%     
==========================================
  Files          43       43              
  Lines        4988     4999      +11     
==========================================
+ Hits         3645     3792     +147     
+ Misses       1343     1207     -136     

Flag	Coverage Δ
ubuntu-latest	74.79% <77.77%> (+2.00%)	⬆️
windows-latest	74.23% <94.73%> (+2.67%)	⬆️

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