Support RowLock in LockGroup

[zhoney]

Change-Id: I725e4504ad221fa6242d9cd1ae1d093301e35917

[codecov[bot]]

Codecov Report

Merging #39 into master will increase coverage by 0.18%. The diff coverage is 80.76%.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
+ Coverage     77.98%   78.17%   +0.18%     
- Complexity      570      586      +16     
============================================
  Files            54       55       +1     
  Lines          1817     1869      +52     
  Branches        268      275       +7     
============================================
+ Hits           1417     1461      +44     
- Misses          281      285       +4     
- Partials        119      123       +4

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (ø)	:arrow_down:
...n/java/com/baidu/hugegraph/concurrent/RowLock.java	80.43% <80.43%> (ø)	11 <11> (?)
...java/com/baidu/hugegraph/concurrent/LockGroup.java	95.65% <83.33%> (-4.35%)	13 <3> (+3)
.../main/java/com/baidu/hugegraph/event/EventHub.java	81.94% <0%> (+1.38%)	27% <0%> (+1%)	:arrow_up:
.../main/java/com/baidu/hugegraph/perf/Stopwatch.java	87.75% <0%> (+2.04%)	21% <0%> (+1%)	:arrow_up:

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[javeme]

mysql lock_rec https://github.com/mysql/mysql-server/blob/4869291f7ee258e136ef03f5a50135fe7329ffb9/storage/innobase/lock/lock0lock.cc#L6468