ext_proc: refactor the allowed override modes #42404
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Commit Message: ext_proc: refactor the allowed override modes
Additional Description:
Prior to this PR the allowed override modes were kept in a vector of enums, and the comparison had an O(n) time complexity.
This PR introduces a new data-structure that converts each ProcessingMode to a single number, and keeps that in a set. Should reduce both memory consumption and time complexity.
Risk Level: low - internal refactor
Testing: Added unit tests for the data-structure
Docs Changes: N/A
Release Notes: N/A
Platform Specific Features: N/A