Use better defaults in the clang-tidy wrapper script (#61651)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61651
This PR sets some QOL defaults to the clang-tidy wrapper script and refactors how defaults are set.
- Runs in parallel
- Custom executable (prints an error message to users asking them to install our custom build)
- `generate_build_files` can now be run as a script
Test Plan: Imported from OSS
Reviewed By: malfet, zhouzhuojie
Differential Revision: D29743661
Pulled By: 1ntEgr8
fbshipit-source-id: 256617d006a03e4ab96091593f5bb80c9b31a2d1
