ci: add automated performance benchmark workflow for pull requests #268
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This PR implements a new CI workflow to monitor performance changes.
Workflow automation: the system executes benchmark tests automatically for every pull request on Linux environments.
Build process: it compiles the project using cmake with the CASBIN_BUILD_BENCHMARK option enabled.
Data analysis: a python script parses the JSON output from Google benchmark to calculate performance differences.
Reporting: the workflow compares execution times between the base and PR branches to detect regressions.
Fixes #266