Split label index table

[javeme]

implement #536

Change-Id: Ib01929b7b572e1c9c6bf1d9458c13290364b43db

[codecov]

Codecov Report

Merging #635 into master will increase coverage by 2.72%.
The diff coverage is 89.83%.

@@             Coverage Diff              @@
##             master     #635      +/-   ##
============================================
+ Coverage     69.46%   72.18%   +2.72%     
- Complexity     3629     3740     +111     
============================================
  Files           218      218              
  Lines         17296    17326      +30     
  Branches       2437     2443       +6     
============================================
+ Hits          12014    12507     +493     
+ Misses         4050     3529     -521     
- Partials       1232     1290      +58

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/baidu/hugegraph/config/CoreOptions.java	98.64% <ø> (ø)	2 <0> (ø)	⬇️
...raph/backend/store/rocksdbsst/RocksDBSstStore.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...graph/backend/store/cassandra/CassandraTables.java	86.09% <100%> (ø)	1 <0> (ø)	⬇️
.../hugegraph/backend/store/rocksdb/RocksDBStore.java	63.97% <100%> (-10.85%)	45 <0> (-9)
...hugegraph/backend/store/rocksdb/RocksDBTables.java	67.52% <100%> (+1.75%)	0 <0> (ø)	⬇️
...idu/hugegraph/backend/store/hbase/HbaseTables.java	88.23% <100%> (+88.23%)	0 <0> (ø)	⬇️
.../java/com/baidu/hugegraph/structure/HugeIndex.java	68.75% <100%> (+1.64%)	24 <3> (+2)	⬆️
...aidu/hugegraph/backend/store/hbase/HbaseStore.java	78.31% <100%> (+78.31%)	29 <0> (+29)	⬆️
...idu/hugegraph/backend/store/mysql/MysqlTables.java	88.5% <100%> (ø)	1 <0> (ø)	⬇️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	80.35% <100%> (+0.05%)	166 <0> (ø)	⬇️
... and 19 more

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