feat: Custom keyword validation #1097

Job	Run time
Verify commit messages	38s
Clippy	45s
Run test coverage	1m 22s
Check features	1m 3s
Rustfmt	18s
Build on wasm32-unknown-unknown	23s
Generic pre-commit checks	26s
Python 3.7 on ubuntu-22.04	2m 46s
Test draft201909 (stable) on ubuntu-22.04	1m 20s
Python 3.8 on ubuntu-22.04	2m 9s
Test draft202012 (stable) on ubuntu-22.04	1m 9s
Python 3.9 on ubuntu-22.04	1m 50s
Test draft201909 (stable) on macos-12	1m 27s
Python 3.10 on ubuntu-22.04	2m 0s
Test draft202012 (stable) on macos-12	1m 28s
Python 3.11 on ubuntu-22.04	2m 1s
Test draft201909 (stable) on windows-2022	4m 3s
Python 3.12 on ubuntu-22.04	1m 54s
Test draft202012 (stable) on windows-2022	3m 4s
Python 3.7 on macos-12	3m 23s
Python 3.8 on macos-12	2m 51s
Python 3.9 on macos-12	4m 37s
Python 3.10 on macos-12	4m 51s
Python 3.11 on macos-12	2m 45s
Python 3.12 on macos-12	2m 49s
Python 3.7 on windows-2022	5m 22s
Python 3.8 on windows-2022	3m 54s
Python 3.9 on windows-2022	4m 23s
Python 3.10 on windows-2022	4m 52s
Python 3.11 on windows-2022	4m 49s
Python 3.12 on windows-2022	4m 21s
	1h 19m 3s

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