Refactor: remove sledstore #4217

Job	Run time
cluster-benchmark (cluster_benchmark)	50s
examples (stable, memstore)	36s
lint	11m 39s
examples (stable, raft-kv-memstore)	2m 27s
examples (stable, raft-kv-memstore-network-v2)	46s
openraft-feature-test (nightly)	51s
openraft-test (stable, 0)	3m 20s
openraft-test-bench (nightly)	1m 2s
openraft-feature-test (nightly, serde)	52s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 5s
openraft-test (nightly, 30)	3m 23s
openraft-feature-test (nightly, single-term-leader)	51s
examples (stable, raft-kv-memstore-singlethreaded)	55s
openraft-test (nightly, 0, single-term-leader)	3m 10s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	53s
examples (stable, raft-kv-rocksdb)	8m 16s
rt-monoio	50s
examples (nightly, memstore)	57s
stores (stores/memstore)	54s
examples (nightly, raft-kv-memstore)	2m 18s
Build (nightly, bench,serde,bt,singlethreaded)	51s
stores (stores/rocksstore)	6m 11s
examples (nightly, raft-kv-memstore-network-v2)	1m 6s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 27s
tests-feature-test (nightly)	2m 56s
tests-feature-test (nightly, single-term-leader)	3m 0s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 8s
examples (nightly, raft-kv-rocksdb)	12m 13s
	1h 14m 47s

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