Migrate `pallet-authorship` to umbrella crate #16910

Job	Run time
check-dependency-rules	8s
check-fail-ci	14s
check-markdown	17s
check-readme	3m 28s
check-workspace	18s
preflight / preflight	47s
preflight / ci-versions	58s
fmt	1m 8s
check-rust-feature-propagation	2m 8s
check-toml-format	57s
check-umbrella	2m 28s
test-rust-features	2m 6s
All quick checks passed	1s
	14m 58s

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