add PageState.page() to simplify access to page info

[javeme]

Change-Id: Idd9ccdc105dbc7f7cc37f6a4a49b8715b363b886

[codecov]

Codecov Report

Merging #429 into master will increase coverage by 0.02%.
The diff coverage is 80%.

@@             Coverage Diff              @@
##             master     #429      +/-   ##
============================================
+ Coverage     70.14%   70.16%   +0.02%     
- Complexity     3272     3273       +1     
============================================
  Files           208      208              
  Lines         16050    16054       +4     
  Branches       2301     2301              
============================================
+ Hits          11258    11265       +7     
+ Misses         3539     3536       -3     
  Partials       1253     1253

Impacted Files	Coverage Δ	Complexity Δ
.../hugegraph/backend/store/BackendEntryIterator.java	64.58% <0%> (ø)	14 <1> (ø)	⬇️
...va/com/baidu/hugegraph/backend/page/QueryList.java	82.1% <100%> (ø)	17 <0> (ø)	⬇️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.36% <100%> (-0.67%)	145 <0> (-1)
...va/com/baidu/hugegraph/backend/page/PageState.java	83.33% <100%> (+2.08%)	11 <1> (+1)	⬆️
...aidu/hugegraph/backend/page/PageEntryIterator.java	82.05% <50%> (ø)	14 <2> (ø)	⬇️
...du/hugegraph/traversal/optimize/TraversalUtil.java	67.38% <75%> (+0.11%)	73 <0> (ø)	⬇️
...a/com/baidu/hugegraph/backend/query/Condition.java	62.96% <0%> (+0.52%)	20% <0%> (ø)	⬇️
...e/src/main/java/com/baidu/hugegraph/HugeGraph.java	71.52% <0%> (+0.97%)	60% <0%> (ø)	⬇️
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	52.69% <0%> (+1.24%)	27% <0%> (+1%)	⬆️

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