Migrate `pallet-authorship` to umbrella crate #11887

Job	Run time
preflight / preflight	46s
preflight / ci-versions	56s
build (polkadot-availability-recovery, availability-recovery-regression-bench)	9m 15s
build (polkadot-availability-distribution, availability-distribution-regression-bench)	7m 5s
build (polkadot-node-core-approval-voting, approval-voting-regression-bench)	24m 28s
build (polkadot-statement-distribution, statement-distribution-regression-bench)	6m 3s
publish-benchmarks	0s
	48m 33s

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