Feat: Make Batch a customizable type in RaftTypeConfig #6190

Job	Run time
bench-minimal (benchmarks/minimal)	41s
test-openraft-core-crates (stable)	1m 55s
test-crate-tests (nightly, 30)	2m 31s
test-crate-tests (nightly, 0, single-term-leader)	2m 3s
tests-feature-test (nightly)	2m 4s
openraft-test-bench (nightly)	27s
lint	43s
rt-compio	39s
test-openraft-core-crates (nightly)	35s
openraft-feature-test (nightly, serde,single-threaded)	29s
openraft-feature-test (nightly, serde)	28s
stores (stores/memstore)	34s
test-crate-tests (stable, 0)	1m 57s
tests-feature-test (nightly, single-term-leader)	2m 4s
Build (nightly, bench,serde,bt,single-threaded)	30s
examples (stable, raft-kv-memstore-grpc)	1m 39s
examples (nightly, log-mem)	55s
examples (stable, multi-raft-kv)	48s
examples (nightly, raft-kv-memstore-network-v2)	1m 1s
examples (stable, raft-kv-memstore-network-v2)	59s
examples (nightly, raft-kv-memstore)	1m 53s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 10s
examples (nightly, raft-kv-memstore-grpc)	1m 32s
examples (stable, rocksstore)	4m 41s
rt-monoio	28s
examples (nightly, multi-raft-kv)	1m 3s
examples (stable, log-mem)	45s
examples (nightly, rocksstore)	4m 55s
examples (nightly, raft-kv-memstore-single-threaded)	1m 3s
examples (stable, raft-kv-memstore)	2m 4s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 23s
openraft-feature-test (nightly)	24s
examples (stable, raft-kv-rocksdb)	6m 19s
examples (stable, raft-kv-memstore-single-threaded)	58s
examples (nightly, raft-kv-rocksdb)	5m 18s
	56m 58s

Provide feedback