optimize schema cache perf through IntObjectMap(array)

[javeme]

• optimize schema cache perf through IntObjectMap(array)
• let array_cache_size = schema_cache_size / 8

Change-Id: Id0cd9bda4085429181f96731a01fb2ee200225c9

[javeme]

related #1155

[codecov]

Codecov Report

Merging #1185 into master will decrease coverage by 35.32%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #1185       +/-   ##
=============================================
- Coverage     64.98%   29.65%   -35.33%     
+ Complexity     5652      263     -5389     
=============================================
  Files           361       75      -286     
  Lines         29429     4208    -25221     
  Branches       4158      510     -3648     
=============================================
- Hits          19123     1248    -17875     
+ Misses         8352     2797     -5555     
+ Partials       1954      163     -1791     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/baidu/hugegraph/api/job/GremlinAPI.java	47.82% <0.00%> (-2.90%)	3.00% <0.00%> (+3.00%)	⬇️
...va/com/baidu/hugegraph/structure/HugeFeatures.java
...ugegraph/backend/page/SortByCountIdHolderList.java
...java/com/baidu/hugegraph/type/define/HugeKeys.java
...va/com/baidu/hugegraph/analyzer/JcsegAnalyzer.java
...kend/store/rocksdbsst/RocksDBSstStoreProvider.java
...om/baidu/hugegraph/exception/NoIndexException.java
...du/hugegraph/backend/store/raft/RaftException.java
.../backend/store/cassandra/CassandraSessionPool.java
...ugegraph/backend/store/BackendStoreSystemInfo.java
... and 275 more

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