ci: add labeller and labels script #1167

Job	Run time
sanity / Check	2m 59s
sanity / Test documentation	3m 50s
sanity / Validate commit messages	2s
sanity / Clippy	3m 29s
sanity / Rustfmt	9s
sanity / Sort dependencies	27s
sanity / Unused dependencies	46s
build and test macOS-aarch64	2m 27s
build and test Linux-x86_64-musl	5m 8s
build Windows-x86_64	5m 16s
backwards_compatibility / check_commit_message	4s
backwards_compatibility / build_and_test	1m 58s
finalize_pr	1s
	26m 36s

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