[#9086] Lightened agentCountJob

[smilu97]

• AgentCountJob only counts agents, not doing others
• GET /selectLatestAgentCount is added

[codecov]

Codecov Report

Merging #9096 (3420689) into master (012fb56) will decrease coverage by 0.00%.
The diff coverage is 13.11%.

@@             Coverage Diff              @@
##             master    #9096      +/-   ##
============================================
- Coverage     39.52%   39.51%   -0.01%     
  Complexity    11664    11664              
============================================
  Files          3351     3351              
  Lines         90371    90406      +35     
  Branches      10059    10061       +2     
============================================
+ Hits          35718    35724       +6     
- Misses        51612    51638      +26     
- Partials       3041     3044       +3     

Impacted Files	Coverage Δ
...ercorp/pinpoint/batch/job/AgentCountProcessor.java	0.00% <0.00%> (ø)
...navercorp/pinpoint/batch/job/AgentCountReader.java	0.00% <0.00%> (ø)
...navercorp/pinpoint/batch/job/AgentCountWriter.java	0.00% <0.00%> (ø)
...oint/web/controller/AgentStatisticsController.java	0.00% <0.00%> (ø)
...inpoint/web/dao/mysql/MysqlAgentStatisticsDao.java	0.00% <0.00%> (ø)
...npoint/web/service/AgentStatisticsServiceImpl.java	0.00% <0.00%> (ø)
...point/web/dao/memory/MemoryAgentStatisticsDao.java	88.88% <72.72%> (-11.12%)	⬇️
...vercorp/pinpoint/rpc/packet/ServerClosePacket.java	47.82% <0.00%> (-17.40%)	⬇️
.../navercorp/pinpoint/rpc/client/RequestManager.java	66.66% <0.00%> (-7.58%)	⬇️
...rp/pinpoint/rpc/server/PinpointServerAcceptor.java	84.10% <0.00%> (-4.64%)	⬇️
... and 7 more

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