feat: Custom keyword validation #1084

Job	Run time
Generic pre-commit checks	20s
Test draft201909 (stable) on ubuntu-22.04	56s
Clippy	25s
Build on wasm32-unknown-unknown	28s
Test draft202012 (stable) on ubuntu-22.04	57s
Verify commit messages	39s
Test draft201909 (stable) on macos-12	1m 16s
Run test coverage	55s
Test draft202012 (stable) on macos-12	1m 40s
Check features	1m 5s
Rustfmt	15s
Test draft201909 (stable) on windows-2022	2m 38s
Test draft202012 (stable) on windows-2022	2m 18s
Python 3.7 on ubuntu-22.04	2m 1s
Python 3.8 on ubuntu-22.04	1m 29s
Python 3.9 on ubuntu-22.04	1m 40s
Python 3.10 on ubuntu-22.04	1m 36s
Python 3.11 on ubuntu-22.04	1m 31s
Python 3.12 on ubuntu-22.04	1m 30s
Python 3.7 on macos-12	2m 46s
Python 3.8 on macos-12	2m 27s
Python 3.9 on macos-12	3m 9s
Python 3.10 on macos-12	2m 15s
Python 3.11 on macos-12	3m 0s
Python 3.12 on macos-12	2m 45s
Python 3.7 on windows-2022	6m 10s
Python 3.8 on windows-2022	4m 31s
Python 3.9 on windows-2022	4m 26s
Python 3.10 on windows-2022	3m 44s
Python 3.11 on windows-2022	3m 46s
Python 3.12 on windows-2022	3m 11s
	1h 5m 49s

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