Remove ContinuousCollisionCandidate inheritance

[zfergus]

Description

This pull request focuses on removing the ContinuousCollisionCandidate class and its references, replacing it with the CollisionStencil class, and updating related documentation and bindings.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Test Configuration:

• OS and Version: macOS 15.3
• Compiler and Version: Apple clang 16.0.0

Checklist

• I have followed the project style guide
• My code follows the clang-format style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.35%. Comparing base (44ad8a7) to head (f71a057).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ipc/collisions/normal/plane_vertex.cpp	0.00%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (69.23%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
- Coverage   96.40%   96.35%   -0.06%     
==========================================
  Files         103      102       -1     
  Lines        7756     7758       +2     
==========================================
- Hits         7477     7475       -2     
- Misses        279      283       +4     

Flag	Coverage Δ
unittests	96.35% <69.23%> (-0.06%)	⬇️

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