Migrate `pallet-authorship` to umbrella crate #16909

Job	Run time
check-dependency-rules	10s
check-fail-ci	15s
check-markdown	14s
check-readme	4m 27s
check-workspace	14s
preflight / preflight	42s
preflight / ci-versions	57s
check-rust-feature-propagation	2m 6s
check-toml-format	1m 1s
check-umbrella	2m 23s
fmt	1m 6s
test-rust-features	2m 3s
All quick checks passed	1s
	15m 39s

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