[#9641] Add new API for agent statistics

[intr3p1d]

No description provided.

[codecov]

Codecov Report

Merging #9646 (35c1af4) into master (6e8fdb7) will decrease coverage by 0.02%.
The diff coverage is 18.86%.

@@             Coverage Diff              @@
##             master    #9646      +/-   ##
============================================
- Coverage     38.95%   38.94%   -0.02%     
+ Complexity    11904    11902       -2     
============================================
  Files          3490     3490              
  Lines         93579    93619      +40     
  Branches      10501    10504       +3     
============================================
+ Hits          36458    36460       +2     
- Misses        53953    53989      +36     
- Partials       3168     3170       +2     

Impacted Files	Coverage Δ
.../authorization/controller/AgentInfoController.java	0.00% <0.00%> (ø)
.../authorization/controller/AgentListController.java	0.00% <0.00%> (ø)
...corp/pinpoint/web/dao/hbase/HbaseAgentInfoDao.java	0.00% <0.00%> (ø)
...orp/pinpoint/web/service/AgentInfoServiceImpl.java	0.00% <0.00%> (ø)
...ercorp/pinpoint/web/vo/agent/AgentStatusQuery.java	79.31% <0.00%> (-2.84%)	⬇️
...p/pinpoint/web/vo/tree/AgentsMapByApplication.java	88.88% <90.90%> (-3.42%)	⬇️
.../pinpoint/web/vo/tree/InstancesListMapBuilder.java	89.47% <0.00%> (-5.27%)	⬇️
...rc/main/java/com/navercorp/pinpoint/test/Item.java	72.22% <0.00%> (-3.71%)	⬇️
...orp/pinpoint/rpc/server/DefaultPinpointServer.java	81.06% <0.00%> (-0.83%)	⬇️
...n/server/bo/serializer/trace/v2/SpanEncoderV0.java	82.88% <0.00%> (-0.54%)	⬇️
... and 5 more

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