removed openpilot.common.numpy_fast #34331

[Shaikimram]

Description
This pull request removes the numpy_fast.py utility and its references across the OpenPilot codebase and opendbc repository. The numpy_fast optimization is no longer necessary in the post-comma two world, as modern numpy functions (np.clip, np.interp, np.mean) offer comparable performance and maintainability.

Changes made:
Removed the numpy_fast.py file from the common directory.
Replaced calls to clip, interp, and mean in dependent files with equivalent numpy functions (np.clip, np.interp, np.mean).
Updated the opendbc repository to ensure no lingering dependencies on numpy_fast.
Verification
Verified all impacted files by replacing references to numpy_fast functions with numpy's built-in alternatives and ensured compatibility.
Additional Notes
Pending Tasks: Unit tests and manual testing in critical modules were not performed as part of this change. Further validation is recommended to ensure no regressions or unexpected behavior.
Removed all remaining references to numpy_fast from the opendbc submodule.

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