[#9371] Add agent load-balancer which periodically change collector server

[smilu97]

resolves #9371

[codecov]

Codecov Report

Merging #9372 (525b36f) into master (e421457) will increase coverage by 0.02%.
The diff coverage is 63.37%.

@@             Coverage Diff              @@
##             master    #9372      +/-   ##
============================================
+ Coverage     39.52%   39.54%   +0.02%     
- Complexity    11800    11825      +25     
============================================
  Files          3411     3413       +2     
  Lines         91322    91500     +178     
  Branches      10124    10149      +25     
============================================
+ Hits          36097    36188      +91     
- Misses        52107    52178      +71     
- Partials       3118     3134      +16     

Impacted Files	Coverage Δ
...p/pinpoint/profiler/context/module/GrpcModule.java	0.00% <0.00%> (ø)
...text/provider/grpc/SpanGrpcDataSenderProvider.java	0.00% <0.00%> (ø)
...point/profiler/sender/grpc/SpanGrpcDataSender.java	0.00% <0.00%> (ø)
...rpc/SubconnectionExpiringLoadBalancerProvider.java	0.00% <0.00%> (ø)
...filer/context/grpc/config/GrpcTransportConfig.java	58.86% <50.00%> (-0.26%)	⬇️
...sender/grpc/SubconnectionExpiringLoadBalancer.java	77.61% <77.61%> (ø)
...rp/pinpoint/grpc/client/DefaultChannelFactory.java	72.54% <100.00%> (ø)
...corp/pinpoint/grpc/client/config/ClientOption.java	68.85% <100.00%> (+1.05%)	⬆️
...p/pinpoint/rpc/client/WriteFailFutureListener.java	56.25% <0.00%> (-25.00%)	⬇️
...p/pinpoint/rpc/stream/StreamChannelRepository.java	57.89% <0.00%> (-21.06%)	⬇️
... and 13 more

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