Migrate `pallet-authorship` to umbrella crate #17088

Job	Run time
preflight / preflight	41s
preflight / ci-versions	57s
check-runtime-migration (westend)	4m 2s
check-runtime-migration (asset-hub-westend)	3m 42s
check-runtime-migration (bridge-hub-westend)	3m 35s
check-runtime-migration (collectives-westend)	3m 33s
check-runtime-migration (coretime-westend)	3m 33s
All runtime migrations passed	1s
	20m 4s

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