feat: Custom keyword validation #1096

Job	Run time
Verify commit messages	43s
Test draft201909 (stable) on ubuntu-22.04	53s
Test draft202012 (stable) on ubuntu-22.04	1m 3s
Build on wasm32-unknown-unknown	48s
Run test coverage	1m 3s
Test draft201909 (stable) on macos-12	2m 45s
Check features	1m 20s
Test draft202012 (stable) on macos-12	2m 36s
Rustfmt	21s
Test draft201909 (stable) on windows-2022	2m 19s
Generic pre-commit checks	25s
Test draft202012 (stable) on windows-2022	4m 3s
Python 3.7 on ubuntu-22.04	2m 7s
Python 3.8 on ubuntu-22.04	1m 56s
Clippy	1m 1s
Python 3.9 on ubuntu-22.04	1m 51s
Python 3.10 on ubuntu-22.04	1m 57s
Python 3.11 on ubuntu-22.04	1m 56s
Python 3.12 on ubuntu-22.04	2m 18s
Python 3.7 on macos-12	3m 13s
Python 3.8 on macos-12	2m 44s
Python 3.9 on macos-12	4m 40s
Python 3.10 on macos-12	2m 49s
Python 3.11 on macos-12	2m 44s
Python 3.12 on macos-12	2m 43s
Python 3.7 on windows-2022	5m 18s
Python 3.8 on windows-2022	4m 58s
Python 3.9 on windows-2022	5m 37s
Python 3.10 on windows-2022	5m 10s
Python 3.11 on windows-2022	5m 0s
Python 3.12 on windows-2022	5m 3s
	1h 21m 24s

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