`TransactionPool` API uses `async_trait` #6230

Job	Run time
preflight / preflight	41s
preflight / ci-versions	59s
cargo-check-all-crate-macos	12m 7s
cargo-check-benches (master)	20m 47s
cargo-check-each-crate (1)	20m 25s
cargo-check-benches (current)	24m 15s
test-frame-ui	46m 43s
cargo-check-each-crate (2)	25m 0s
test-full-crypto-feature	2m 38s
cargo-check-each-crate (3)	9m 44s
cargo-check-each-crate (4)	22m 44s
test-node-metrics	11m 1s
cargo-check-each-crate (5)	31m 51s
cargo-check-each-crate (6)	16m 9s
cargo-check-each-crate (7)	33m 44s
test-frame-examples-compile-to-wasm	2m 56s
test-deterministic-wasm	6m 26s
check-tracing	2m 20s
check-metadata-hash	6m 5s
node-bench-regression-guard	13s
All test misc tests passed	2s
	4h 56m 50s

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