Add bitmap collision detection unit tests

[222448082Ashen]

Extend unit_test_bitmap.cpp with comprehensive collision tests. Adds test cases for point, rectangle, and circle collisions as well as bitmap-to-bitmap collisions, creating small bitmaps with specific opaque/transparent pixels, calling setup_collision_mask, and verifying collision functions (bitmap_point_collision, bitmap_rectangle_collision, bitmap_circle_collision, bitmap_collision) across offsets and edge cases.

Description

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motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• Documentation (update or new)

How Has This Been Tested?

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Testing Checklist

• Tested with sktest
• Tested with skunit_tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have requested a review from ... on the Pull Request