`TransactionPool` API uses `async_trait` #14078

Job	Run time
check-dependency-rules	9s
check-fail-ci	10s
check-markdown	14s
check-readme	3m 5s
check-workspace	17s
preflight / preflight	42s
preflight / ci-versions	1m 1s
fmt	1m 6s
check-rust-feature-propagation	2m 3s
test-rust-features	2m 4s
check-toml-format	1m 0s
check-umbrella	2m 40s
All quick checks passed	1s
	14m 32s

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