Refactor: Replace async Mutex for `RaftInner.core_state` with standar… #315

Job	Run time
cluster-benchmark (cluster_benchmark)	48s
examples (stable, memstore)	46s
lint	12m 32s
examples (stable, raft-kv-memstore)	2m 37s
examples (stable, raft-kv-memstore-network-v2)	1m 2s
openraft-feature-test (nightly)	50s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 36s
openraft-feature-test (nightly, serde)	51s
examples (stable, raft-kv-memstore-singlethreaded)	1m 3s
openraft-feature-test (nightly, single-term-leader)	49s
examples (stable, raft-kv-rocksdb)	8m 37s
examples (nightly, memstore)	57s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	48s
examples (nightly, raft-kv-memstore)	2m 21s
examples (nightly, raft-kv-memstore-network-v2)	1m 20s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 55s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 25s
openraft-test (stable, 0)	3m 32s
openraft-test-bench (nightly)	1m 0s
examples (nightly, raft-kv-rocksdb)	12m 35s
openraft-test (nightly, 30)	3m 40s
stores (stores/memstore)	54s
openraft-test (nightly, 0, single-term-leader)	3m 22s
Build (nightly, bench,serde,bt,singlethreaded)	51s
stores (stores/rocksstore)	6m 14s
stores (stores/sledstore)	1m 5s
tests-feature-test (nightly)	3m 8s
tests-feature-test (nightly, single-term-leader)	3m 13s
tests-feature-test (nightly, loosen-follower-log-revert)	3m 11s
	1h 23m 2s

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