add maxValueOf() for NumericUtil

[zhoney]

Change-Id: Ida0369ad8affc34d53169d48c05fc815d7113f1f

[codecov]

Codecov Report

Merging #30 into master will increase coverage by 0.17%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master      #30      +/-   ##
============================================
+ Coverage      74.6%   74.77%   +0.17%     
- Complexity      472      480       +8     
============================================
  Files            47       47              
  Lines          1579     1590      +11     
  Branches        235      241       +6     
============================================
+ Hits           1178     1189      +11     
- Misses          293      294       +1     
+ Partials        108      107       -1

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (ø)	⬇️
...ain/java/com/baidu/hugegraph/util/NumericUtil.java	83.59% <81.81%> (-0.17%)	68 <6> (+6)
.../main/java/com/baidu/hugegraph/event/EventHub.java	81.94% <0%> (+1.38%)	27% <0%> (+1%)	⬆️
.../main/java/com/baidu/hugegraph/perf/Stopwatch.java	87.75% <0%> (+2.04%)	21% <0%> (+1%)	⬆️

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