Improve ListValue api

[coderzc]

No description provided.

[codecov]

Codecov Report

Merging #202 (df6f7aa) into master (adf6801) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #202      +/-   ##
============================================
+ Coverage     85.73%   85.83%   +0.10%     
- Complexity     3239     3240       +1     
============================================
  Files           344      344              
  Lines         12111    12107       -4     
  Branches       1099     1098       -1     
============================================
+ Hits          10383    10392       +9     
+ Misses         1198     1186      -12     
+ Partials        530      529       -1     

Impacted Files	Coverage Δ
...rithm/path/rings/filter/RingsDetectionMessage.java	94.44% <ø> (ø)
...hugegraph/computer/core/graph/value/ListValue.java	95.74% <100.00%> (-0.18%)	⬇️
.../baidu/hugegraph/computer/core/bsp/EtcdClient.java	72.81% <0.00%> (+0.92%)	⬆️
...k8s/operator/controller/ComputerJobController.java	90.06% <0.00%> (+1.36%)	⬆️
...com/baidu/hugegraph/computer/core/bsp/BspBase.java	100.00% <0.00%> (+7.69%)	⬆️
...idu/hugegraph/computer/core/util/ShutdownHook.java	66.66% <0.00%> (+22.22%)	⬆️

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