feat: Custom keyword validation (#473) #1101

Job	Run time
Build on wasm32-unknown-unknown	38s
Run test coverage	1m 38s
Verify commit messages	41s
Rustfmt	12s
Generic pre-commit checks	27s
Python 3.7 on ubuntu-22.04	2m 13s
Clippy	1m 33s
Python 3.8 on ubuntu-22.04	1m 52s
Check features	1m 4s
Test draft201909 (stable) on ubuntu-22.04	1m 39s
Python 3.9 on ubuntu-22.04	1m 55s
Test draft202012 (stable) on ubuntu-22.04	1m 17s
Python 3.10 on ubuntu-22.04	2m 1s
Test draft201909 (stable) on macos-12	2m 9s
Python 3.11 on ubuntu-22.04	2m 4s
Test draft202012 (stable) on macos-12	2m 17s
Python 3.12 on ubuntu-22.04	1m 50s
Test draft201909 (stable) on windows-2022	4m 31s
Python 3.7 on macos-12	5m 26s
Test draft202012 (stable) on windows-2022	3m 35s
Python 3.8 on macos-12	2m 54s
Python 3.9 on macos-12	7m 48s
Python 3.10 on macos-12	4m 49s
Python 3.11 on macos-12	4m 36s
Python 3.12 on macos-12	5m 0s
Python 3.7 on windows-2022	5m 22s
Python 3.8 on windows-2022	4m 6s
Python 3.9 on windows-2022	5m 19s
Python 3.10 on windows-2022	4m 12s
Python 3.11 on windows-2022	4m 21s
Python 3.12 on windows-2022	5m 8s
	1h 32m 37s

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