Remove unnecessary locks in keeperStore

[lzydmxy]

Which issues of this PR fixes:

This PR try to fix #239

Change log:

• remove node's lock
• remove nodeMap's lock

Slightly peformance improve

# before
thread_size,tps,avgRT(microsecond),TP90(microsecond),TP99(microsecond),TP999(microsecond),failRate
200,97658,2064.0,2900.0,3700.0,5200.0,0.0
200,97157,2066.0,2900.0,3800.0,6000.0,0.0
# after
thread_size,tps,avgRT(microsecond),TP90(microsecond),TP99(microsecond),TP999(microsecond),failRate
200,100083,2014.0,3000.0,3800.0,5500.0,0.0
200,99541,2025.0,3000.0,3700.0,5200.0,0.0

[lzydmxy]

@JackyWoo Failed for TEST(RaftPerformance, machineCreateThread), should i remove it ? Since RK::ConcurrentMap is no longer thread-safe

[JackyWoo]

We can make it single thread. Also let's rename ConcurrentMap .

[lzydmxy]

We can make it single thread. Also let's rename ConcurrentMap .

okay

[JackyWoo]

@lzydmxy let's test the performance with relaxed memory order of node_count which should provide some promotion.

[lzydmxy]

Snapshot load faster than before. 49s vs 22s

# before
2024.04.28 12:19:26.121504 [ 2481991 ] <Information> KeeperSnapshotStore: Parse object from disk
2024.04.28 12:20:12.085832 [ 2481991 ] <Information> KeeperSnapshotStore: Build ChildrenSet for nodes
2024.04.28 12:20:15.807878 [ 2481991 ] <Information> KeeperSnapshotStore: Load snapshot done: nodes 58659723, ephemeral nodes 0, sessions 0, session_id_counter 121406, zxid 52981993478

#after
2024.04.28 12:26:09.077839 [ 2488186 ] <Information> KeeperSnapshotStore: Parse object from disk
2024.04.28 12:26:20.132151 [ 2488186 ] <Information> KeeperSnapshotStore: Build DataTree
2024.04.28 12:26:31.131679 [ 2488186 ] <Information> KeeperSnapshotStore: Load snapshot done: nodes 58659723, ephemeral nodes 0, sessions 0, session_id_counter 121406, zxid 52981993478

This is the impact of recent optimizations on the loading speed of snapshots.
Snapshot with 58659723 Nodes
Native(snapshot v1) 160s
After #222 99s
After #228 (snapshot v3) 49s