feat: support connection status api

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 27 lines in your changes missing coverage. Please review.

Please upload report for BASE (master-v2@0753030). Learn more about missing BASE report.

❗ Current head 2f7c51c differs from pull request most recent head 88f969c

Please upload reports for the commit 88f969c to get more accurate results.

Files	Patch %	Lines
internal/io/connection/connection_mock.go	20.00%	12 Missing ⚠️
internal/io/connection/connection_pool.go	72.00%	4 Missing and 3 partials ⚠️
internal/server/connection.go	0.00%	7 Missing ⚠️
internal/server/rest.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master-v2    #2906   +/-   ##
============================================
  Coverage             ?   67.85%           
============================================
  Files                ?      294           
  Lines                ?    28243           
  Branches             ?        0           
============================================
  Hits                 ?    19164           
  Misses               ?     7369           
  Partials             ?     1710           

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