feat: Custom keyword validation #1095

Job	Run time
Generic pre-commit checks	22s
Build on wasm32-unknown-unknown	37s
Test draft201909 (stable) on ubuntu-22.04	1m 3s
Clippy	35s
Test draft202012 (stable) on ubuntu-22.04	1m 14s
Verify commit messages	43s
Test draft201909 (stable) on macos-12	2m 39s
Run test coverage	1m 6s
Check features	55s
Test draft202012 (stable) on macos-12	3m 13s
Test draft201909 (stable) on windows-2022	3m 37s
Rustfmt	16s
Test draft202012 (stable) on windows-2022	3m 37s
Python 3.7 on ubuntu-22.04	2m 22s
Python 3.8 on ubuntu-22.04	1m 56s
Python 3.9 on ubuntu-22.04	1m 56s
Python 3.10 on ubuntu-22.04	1m 48s
Python 3.11 on ubuntu-22.04	2m 4s
Python 3.12 on ubuntu-22.04	1m 47s
Python 3.7 on macos-12	3m 49s
Python 3.8 on macos-12	4m 49s
Python 3.9 on macos-12	4m 30s
Python 3.10 on macos-12	3m 3s
Python 3.11 on macos-12	2m 57s
Python 3.12 on macos-12	4m 35s
Python 3.7 on windows-2022	4m 52s
Python 3.8 on windows-2022	4m 53s
Python 3.9 on windows-2022	4m 16s
Python 3.10 on windows-2022	4m 43s
Python 3.11 on windows-2022	4m 56s
Python 3.12 on windows-2022	4m 25s
	1h 23m 38s

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