fix: transfer add_peer/remove_peer command to leader

[simon824]

fixed #2111

Environment

	127.0.0.1:9001	127.0.0.1:9002	127.0.0.1:9003
server.role	master	worker	worker
raft.role	replicator	leader	replicator

1. list all peers

2. add peer 127.0.0.1:9003

3. check async task

4. list all peers again

[codecov]

Codecov Report

Merging #2112 (367ed7d) into master (c8e0f0c) will decrease coverage by 4.24%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2112      +/-   ##
============================================
- Coverage     69.38%   65.14%   -4.24%     
- Complexity      977      979       +2     
============================================
  Files           479      481       +2     
  Lines         39655    39701      +46     
  Branches       5578     5580       +2     
============================================
- Hits          27513    25863    -1650     
- Misses         9489    11272    +1783     
+ Partials       2653     2566      -87     

Impacted Files	Coverage Δ
...ache/hugegraph/backend/store/raft/RaftContext.java	0.00% <0.00%> (-80.96%)	⬇️
...graph/backend/store/raft/RaftGroupManagerImpl.java	0.00% <0.00%> (-28.34%)	⬇️
...graph/backend/store/raft/rpc/AddPeerProcessor.java	0.00% <0.00%> (ø)
...ph/backend/store/raft/rpc/RemovePeerProcessor.java	0.00% <0.00%> (ø)
...hugegraph/backend/store/raft/RaftStoreClosure.java	0.00% <0.00%> (-100.00%)	⬇️
...ugegraph/backend/store/rocksdb/RocksDBMetrics.java	0.00% <0.00%> (-85.87%)	⬇️
.../org/apache/hugegraph/variables/HugeVariables.java	0.00% <0.00%> (-85.06%)	⬇️
...gegraph/backend/store/rocksdb/RocksDBFeatures.java	4.16% <0.00%> (-83.34%)	⬇️
...pache/hugegraph/backend/store/raft/RaftResult.java	0.00% <0.00%> (-81.25%)	⬇️
... and 63 more

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