Refactor: delete async-trait, fix typo, use tokio to replace async_std #27

Job	Run time
openraft-test-bench (nightly)	54s
stores (memstore)	42s
stores (rocksstore)	5m 51s
cluster-benchmark (cluster_benchmark)	43s
stores (rocksstore-compat07)	6m 16s
stores (sledstore)	49s
external-stores (stores/rocksstore-v2)	5m 51s
lint	6m 43s
openraft-feature-test (nightly)	46s
openraft-feature-test (nightly, serde)	48s
openraft-test (stable, 0)	2m 57s
openraft-feature-test (nightly, single-term-leader)	49s
Build (nightly, bench,serde,bt,singlethreaded)	48s
openraft-test (nightly, 30)	3m 11s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	48s
openraft-test (nightly, 0, single-term-leader)	2m 56s
tests-feature-test (nightly)	2m 50s
tests-feature-test (nightly, single-term-leader)	2m 44s
examples (stable, raft-kv-memstore)	2m 20s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 44s
examples (stable, raft-kv-memstore-singlethreaded)	56s
examples (stable, raft-kv-rocksdb)	6m 27s
examples (nightly, raft-kv-memstore)	2m 8s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 16s
examples (nightly, raft-kv-rocksdb)	6m 27s
	1h 8m 44s

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