Migrate `pallet-authorship` to umbrella crate #11886

Job	Run time
preflight / preflight	1m 22s
preflight / ci-versions	58s
build (polkadot-availability-recovery, availability-recovery-regression-bench)	7m 56s
build (polkadot-availability-distribution, availability-distribution-regression-bench)	5m 39s
build (polkadot-node-core-approval-voting, approval-voting-regression-bench)	23m 2s
build (polkadot-statement-distribution, statement-distribution-regression-bench)	4m 42s
publish-benchmarks	0s
	43m 39s

Provide feedback