Refactor: Add gRPC network kv-memstore example (#1274) #4235

Job	Run time
stores (stores/memstore)	54s
openraft-test-bench (nightly)	1m 0s
openraft-test (stable, 0)	3m 20s
stores (stores/rocksstore)	6m 17s
Build (nightly, bench,serde,bt,singlethreaded)	55s
openraft-test (nightly, 30)	3m 24s
openraft-test (nightly, 0, single-term-leader)	3m 14s
cluster-benchmark (cluster_benchmark)	46s
examples (stable, memstore)	49s
lint	12m 2s
examples (stable, raft-kv-memstore)	2m 41s
examples (stable, raft-kv-memstore-grpc)	1m 51s
examples (stable, raft-kv-memstore-network-v2)	1m 8s
openraft-feature-test (nightly)	52s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 19s
examples (stable, raft-kv-memstore-singlethreaded)	59s
examples (stable, raft-kv-rocksdb)	8m 13s
openraft-feature-test (nightly, serde)	53s
examples (nightly, memstore)	1m 2s
openraft-feature-test (nightly, single-term-leader)	52s
examples (nightly, raft-kv-memstore)	2m 26s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	55s
examples (nightly, raft-kv-memstore-grpc)	1m 44s
examples (nightly, raft-kv-memstore-network-v2)	1m 10s
rt-monoio	46s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 25s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 9s
tests-feature-test (nightly)	3m 4s
examples (nightly, raft-kv-rocksdb)	12m 40s
tests-feature-test (nightly, single-term-leader)	2m 56s
	1h 20m 46s

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