Migrate `pallet-verify-signature` to umbrella crate #16918

Job	Run time
check-dependency-rules	9s
check-fail-ci	17s
check-markdown	14s
check-workspace	15s
check-readme	2m 58s
preflight / preflight	1m 19s
preflight / ci-versions	59s
test-rust-features	1m 55s
fmt	1m 2s
check-rust-feature-propagation	1m 52s
check-toml-format	59s
check-umbrella	2m 10s
All quick checks passed	1s
	14m 10s

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