support P.textcontains() for rest-api query

[javeme]

how to use:
/graphs/hugegraph/graph/vertices?properties={"city": "P.textcontains(\"shanghai\")"}

note query format by gremlin: g.V().has("city", Text.contains("shanghai"))

improve: #1309
Change-Id: I2d7c0b8c58c6ac53cd6b99414859cb0510393f6c

[javeme]

init test data:

graph.schema().propertyKey('name').asText().ifNotExist().create();
graph.schema().propertyKey('city').asText().ifNotExist().create();
graph.schema().vertexLabel('person').properties('name','city').useCustomizeNumberId().ifNotExist().create();
graph.schema().indexLabel('personByName').secondary().onV('person').by('name').ifNotExist().create();
graph.schema().indexLabel('personByCity').search().onV('person').by('city').ifNotExist().create();
g.addV('person').property(id,1).property('name','Jermy').property('city','Beijing Haidian')
 .addV('person').property(id,2).property('name','jleaf').property('city','Shanghai Zhangjiang')
 .addV('person').property(id,3).property('name','jewel').property('city','Shanghai Pudong');

test api:
http://127.0.0.1:8080/graphs/hugegraph/graph/vertices?limit=10&properties={"city":"P.textcontains(\"shanghai\")"}

[codecov]

Codecov Report

Merging #1312 (2b19239) into master (f6c9850) will increase coverage by 0.64%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1312      +/-   ##
============================================
+ Coverage     61.67%   62.32%   +0.64%     
- Complexity     5752     5772      +20     
============================================
  Files           377      377              
  Lines         31501    31510       +9     
  Branches       4413     4413              
============================================
+ Hits          19428    19638     +210     
+ Misses        10088     9878     -210     
- Partials       1985     1994       +9     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	78.10% <0.00%> (-0.29%)	32.00 <0.00> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	81.13% <0.00%> (-0.19%)	203.00 <0.00> (ø)
...baidu/hugegraph/traversal/optimize/ConditionP.java	57.14% <ø> (ø)	3.00 <0.00> (ø)
...du/hugegraph/traversal/optimize/TraversalUtil.java	56.65% <0.00%> (-0.62%)	122.00 <0.00> (ø)
.../baidu/hugegraph/backend/query/ConditionQuery.java	86.40% <0.00%> (+0.40%)	106.00% <0.00%> (+1.00%)
.../backend/store/cassandra/CassandraSessionPool.java	57.14% <0.00%> (+1.02%)	11.00% <0.00%> (ø%)
...om/baidu/hugegraph/backend/store/BackendTable.java	73.33% <0.00%> (+48.50%)	11.00% <0.00%> (ø%)
...h/backend/store/scylladb/ScyllaDBTablesWithMV.java	96.03% <0.00%> (+96.03%)	10.00% <0.00%> (+10.00%)
...graph/backend/store/scylladb/ScyllaDBFeatures.java	100.00% <0.00%> (+100.00%)	3.00% <0.00%> (+3.00%)
.../backend/store/scylladb/ScyllaDBStoreProvider.java	100.00% <0.00%> (+100.00%)	7.00% <0.00%> (+7.00%)

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