feat(lint): add external-function lint (#14737) #8011

Job	Run time
forge-fmt	2m 59s
doctest	3m 27s
shellcheck	31s
typos	30s
clippy	2m 6s
analyze (actions)	38s
deny / cargo deny check	1m 41s
rustfmt	36s
test / build matrices	7s
docs / docs	8m 48s
no-default-features	3m 7s
test / test external (aarch64-unknown-linux-gnu)	12m 44s
test / test external (x86_64-unknown-linux-gnu)	12m 38s
test / test all (aarch64-apple-darwin)	6m 28s
test / test all (aarch64-unknown-linux-gnu)	4m 17s
test / test external (aarch64-apple-darwin)	12m 40s
test / test external (x86_64-pc-windows-msvc)	24m 50s
test / test all (x86_64-pc-windows-msvc)	10m 40s
test / test all (x86_64-unknown-linux-gnu)	4m 45s
docs / deploy-docs	1m 16s
ci-success	4s
	1h 54m 52s

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