add the ability to declare multiple impl blocks #9531

Job	Run time
preflight / preflight	44s
preflight / ci-versions	1m 0s
cargo-check-benches (master)	20m 55s
cargo-check-benches (current)	27m 8s
cargo-check-all-crate-macos	12m 18s
test-frame-ui	29m 21s
cargo-check-each-crate (1)	44m 40s
test-full-crypto-feature	2m 35s
cargo-check-each-crate (2)	39m 58s
test-node-metrics	14m 16s
cargo-check-each-crate (3)	17m 37s
cargo-check-each-crate (4)	41m 39s
cargo-check-each-crate (5)	49m 12s
cargo-check-each-crate (6)	22m 29s
cargo-check-each-crate (7)	45m 40s
test-frame-examples-compile-to-wasm	2m 55s
test-deterministic-wasm	8m 53s
check-tracing	2m 16s
check-metadata-hash	7m 47s
node-bench-regression-guard	12s
All test misc tests passed	1s
	6h 31m 36s

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