implement RamTable

[javeme]

• implement RamTable
• plugin ramtable to StandardHugeGrap.edges(query)
• plugin ramtable to GraphTransaction.queryEdgesFromBackend(Query query)
• allow config vertices/edges capacity of ramtable
• tiny improve: remove empty line and delete IntLongMap
• support concurrent loading
• fix edge direction of result is set to BOTH when query with BOTH
• add Consumers class to util package
• fix ramtable missing some edges if vertex id is big long number(overflow int)
• fix ramtable edge id(direction IN) does not exist and adjacent vertex without props
• support load from file and export to file

Change-Id: I4e1a5c06bd331dc29a92dcb76843990863dfe6ca

[houzhizhen]

if(ramtable) is more understandable

[houzhizhen]

It is better to put this.done in finally clause.

[codecov]

Codecov Report

Merging #1183 into master will increase coverage by 1.24%.
The diff coverage is 61.98%.

@@             Coverage Diff              @@
##             master    #1183      +/-   ##
============================================
+ Coverage     64.45%   65.70%   +1.24%     
- Complexity     5596     5729     +133     
============================================
  Files           356      361       +5     
  Lines         28929    29429     +500     
  Branches       4066     4158      +92     
============================================
+ Hits          18646    19335     +689     
+ Misses         8395     8134     -261     
- Partials       1888     1960      +72     

Impacted Files	Coverage Δ	Complexity Δ
...aidu/hugegraph/backend/store/ram/IntObjectMap.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../main/java/com/baidu/hugegraph/util/Consumers.java	48.03% <48.03%> (ø)	14.00 <14.00> (?)
.../baidu/hugegraph/backend/store/ram/IntLongMap.java	59.37% <59.37%> (ø)	8.00 <8.00> (?)
...m/baidu/hugegraph/backend/store/ram/IntIntMap.java	62.50% <62.50%> (ø)	8.00 <8.00> (?)
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	80.00% <63.15%> (-0.76%)	118.00 <3.00> (+2.00)	⬇️
...om/baidu/hugegraph/backend/store/ram/RamTable.java	66.88% <66.88%> (ø)	30.00 <30.00> (?)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.28% <76.92%> (-0.09%)	306.00 <0.00> (ø)
...ugegraph/backend/cache/CachedGraphTransaction.java	88.88% <100.00%> (+0.25%)	40.00 <14.00> (+2.00)
...n/java/com/baidu/hugegraph/config/CoreOptions.java	99.31% <100.00%> (+0.04%)	2.00 <0.00> (ø)
...n/java/com/baidu/hugegraph/structure/HugeEdge.java	73.71% <100.00%> (ø)	83.00 <0.00> (ø)
... and 29 more

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