feat: Custom keyword validation #1098

Job	Run time
Verify commit messages	38s
Build on wasm32-unknown-unknown	23s
Clippy	57s
Run test coverage	1m 14s
Check features	1m 8s
Rustfmt	17s
Generic pre-commit checks	23s
Python 3.7 on ubuntu-22.04	2m 18s
Test draft201909 (stable) on ubuntu-22.04	58s
Python 3.8 on ubuntu-22.04	1m 55s
Test draft202012 (stable) on ubuntu-22.04	1m 2s
Python 3.9 on ubuntu-22.04	1m 57s
Test draft201909 (stable) on macos-12	1m 32s
Python 3.10 on ubuntu-22.04	1m 55s
Test draft202012 (stable) on macos-12	3m 35s
Python 3.11 on ubuntu-22.04	1m 53s
Test draft201909 (stable) on windows-2022	3m 27s
Python 3.12 on ubuntu-22.04	1m 55s
Test draft202012 (stable) on windows-2022	2m 47s
Python 3.7 on macos-12	4m 47s
Python 3.8 on macos-12	2m 53s
Python 3.9 on macos-12	7m 0s
Python 3.10 on macos-12	3m 30s
Python 3.11 on macos-12	7m 3s
Python 3.12 on macos-12	2m 43s
Python 3.7 on windows-2022	5m 44s
Python 3.8 on windows-2022	4m 32s
Python 3.9 on windows-2022	5m 57s
Python 3.10 on windows-2022	4m 32s
Python 3.11 on windows-2022	5m 16s
Python 3.12 on windows-2022	5m 31s
	1h 29m 42s

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