improve efficiency of list difference

[nocvalight]

Motivation:

The efficiency is too low while doing list difference, when list size is 10000, it cost almost 4000ms.

Modification:

Use set difference instead of list difference.

Result:

SetDifference is 100 times more efficient than ListDifference, with a little more temporary memory allocation.

BenchMark result:

[codecov[bot]]

Codecov Report

Merging #1241 (e26141f) into master (169016c) will increase coverage by 0.06%. The diff coverage is 96.66%.

@@             Coverage Diff              @@
##             master    #1241      +/-   ##
============================================
+ Coverage     72.04%   72.11%   +0.06%     
- Complexity      779      780       +1     
============================================
  Files           410      411       +1     
  Lines         17376    17404      +28     
  Branches       2703     2710       +7     
============================================
+ Hits          12519    12551      +32     
+ Misses         3475     3469       -6     
- Partials       1382     1384       +2     

Impacted Files	Coverage Δ
.../java/com/alipay/sofa/rpc/common/RpcConstants.java	100.00% <ø> (ø)
.../main/java/com/alipay/sofa/rpc/common/Version.java	100.00% <ø> (ø)
...m/alipay/sofa/rpc/common/struct/SetDifference.java	96.15% <96.15%> (ø)
...ay/sofa/rpc/client/AllConnectConnectionHolder.java	60.76% <100.00%> (+0.25%)	:arrow_up:
...ipay/sofa/rpc/codec/bolt/SofaRpcSerialization.java	76.19% <100.00%> (+0.17%)	:arrow_up:
.../alipay/sofa/rpc/common/struct/ListDifference.java	93.10% <0.00%> (-3.45%)	:arrow_down:
...om/alipay/sofa/rpc/server/triple/TripleServer.java	74.86% <0.00%> (-1.07%)	:arrow_down:
...java/com/alipay/sofa/rpc/module/LookoutModule.java	85.71% <0.00%> (+33.33%)	:arrow_up:

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