Replace Nav, Position and VisibilityChecker with cs2-nav rust alternatives

[JanEricNitschke]

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[Copilot]

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

tests/test_visibility.py:32

• Verify that the new ray_intersection method returns results consistent with the previous _ray_triangle_intersection implementation, particularly regarding the handling of intersection distances.

t = triangle.ray_intersection(start_vec, direction)

awpy/vector.py:7

• [nitpick] Aliasing cs2_nav's Position class as Vector3 may be slightly misleading if Position has differing semantics compared to the original Vector3; consider adding a clarifying comment if needed.

from cs2_nav import Position as Vector3  # noqa: F401