encode numeric values in secondary index and primary-key

[javeme]

Change-Id: I6acfad358745a54284f80d236243bfbef61d2deb

[codecov]

Codecov Report

Merging #676 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #676      +/-   ##
============================================
- Coverage     72.93%   72.91%   -0.02%     
  Complexity     3919     3919              
============================================
  Files           218      218              
  Lines         17688    17688              
  Branches       2533     2533              
============================================
- Hits          12901    12898       -3     
- Misses         3468     3471       +3     
  Partials       1319     1319

Impacted Files	Coverage Δ	Complexity Δ
...du/hugegraph/backend/tx/GraphIndexTransaction.java	80.24% <100%> (-0.61%)	174 <0> (-4)
...java/com/baidu/hugegraph/structure/HugeVertex.java	77.29% <100%> (ø)	65 <0> (ø)	⬇️
.../baidu/hugegraph/backend/query/ConditionQuery.java	83.55% <100%> (+0.6%)	95 <5> (+5)	⬆️

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