`fatxpool`: `LocalTransactionPool` implemented #11557

Job	Run time
check-dependency-rules	8s
check-fail-ci	10s
check-markdown	16s
check-workspace	19s
preflight / preflight	43s
preflight / ci-versions	59s
fmt	1m 3s
check-rust-feature-propagation	2m 3s
check-toml-format	55s
test-rust-features	2m 5s
check-umbrella	2m 18s
All quick checks passed	1s
	11m 0s

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