[#6809] Support the function of storing custom metrics

[koo-taejin]

This feature is under development.

commit description
for collector side
Collect store customMetrics to Hbase storeage.

[codecov-commenter]

Codecov Report

Merging #7001 into master will decrease coverage by 0.04%.
The diff coverage is 34.51%.

@@            Coverage Diff             @@
##           master    #7001      +/-   ##
==========================================
- Coverage   38.98%   38.93%   -0.05%     
==========================================
  Files        3235     3258      +23     
  Lines       94416    94890     +474     
  Branches    11852    11905      +53     
==========================================
+ Hits        36807    36945     +138     
- Misses      54661    54989     +328     
- Partials     2948     2956       +8     

Impacted Files	Coverage Δ
...tor/handler/grpc/GrpcAgentCustomMetricHandler.java	0.00% <0.00%> (ø)
...apper/grpc/metric/GrpcAgentCustomMetricMapper.java	0.00% <0.00%> (ø)
...r/mapper/grpc/metric/GrpcIntCountMetricMapper.java	0.00% <0.00%> (ø)
.../mapper/grpc/metric/GrpcLongCountMetricMapper.java	0.00% <0.00%> (ø)
...npoint/collector/receiver/StatDispatchHandler.java	0.00% <0.00%> (ø)
...t/collector/receiver/grpc/service/StatService.java	0.00% <0.00%> (ø)
...ctor/service/AgentCustomMetricServiceRegistry.java	0.00% <0.00%> (ø)
...llector/service/HbaseAgentCustomMetricService.java	0.00% <0.00%> (ø)
...mmon/server/bo/codec/metric/CustomMetricCodec.java	0.00% <0.00%> (ø)
...on/server/bo/codec/metric/CustomMetricEncoder.java	0.00% <0.00%> (ø)
... and 57 more

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