Make poll interval configurable per source #2125

Job	Run time
Audit dependencies	25s
Format	8s
Clippy (x86_64-unknown-linux-gnu, false, true)	40s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	50s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	26s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 3s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	23s
Smoke-test fuzzing targets	3m 49s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 25s
Validate man pages	8s
Smoke-test fuzzing targets (--all-features)	3m 55s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	24s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	59s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 1s
Check unused dependencies	50s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	51s
Validate configs	30s
Build and test (msrv, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	1m 24s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-musl)	1m 1s
Build and test (stable, macos-latest, --all-features, x86_64-apple-darwin)	59s
	21m 11s

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