support paging for task

[zhoney]

related: #718

Change-Id: I9c5adcfe3e3d486ed832d98a923287a6f97f84bb

[codecov]

Codecov Report

Merging #68 into master will increase coverage by 0.03%.
The diff coverage is 75%.

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
+ Coverage     75.64%   75.68%   +0.03%     
- Complexity      557      563       +6     
============================================
  Files            95       96       +1     
  Lines          2406     2418      +12     
  Branches        154      155       +1     
============================================
+ Hits           1820     1830      +10     
- Misses          472      473       +1     
- Partials        114      115       +1

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/baidu/hugegraph/driver/TaskManager.java	28.57% <0%> (-4.77%)	2 <0> (ø)
...va/com/baidu/hugegraph/api/task/TasksWithPage.java	100% <100%> (ø)	3 <3> (?)
.../main/java/com/baidu/hugegraph/structure/Task.java	15% <100%> (+2.17%)	5 <1> (+1)	⬆️
...ain/java/com/baidu/hugegraph/api/task/TaskAPI.java	76.78% <80%> (+2.78%)	13 <1> (+2)	⬆️

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