Implement configuration extension support (#1391) #47

Job	Run time
build / generate-license	54s
build / lint-rust	18s
build / lint-python	9s
build / lint-toml	6s
build / check-crates-patch	0s
build / ManyLinux arm64	2m 33s
build / macOS arm64 & Windows (3.10, windows-latest)	2m 45s
build / Source distribution	14m 49s
build / macOS arm64 & Windows (3.10, macos-latest)	1m 45s
build / ManyLinux x86_64	1m 44s
build / build-macos-x86_64 (3.10)	12m 50s
build / Build docs	-1s
build / Merge build artifacts	0s
test	-1s
	37m 51s

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