Migrate `pallet-authorship` to umbrella crate #16912

Job	Run time
check-dependency-rules	9s
check-markdown	14s
check-readme	3m 16s
check-fail-ci	9s
check-workspace	18s
preflight / preflight	43s
preflight / ci-versions	57s
check-umbrella	2m 22s
check-rust-feature-propagation	2m 6s
check-toml-format	1m 0s
test-rust-features	2m 2s
fmt	1m 6s
All quick checks passed	1s
	14m 23s

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