feat(connection): support connection status change

[ngjaying]

• Notify status change in source/sink
• Export the disconnect info to rule metric

[codecov]

Codecov Report

Attention: Patch coverage is 78.00512% with 86 lines in your changes missing coverage. Please review.

Project coverage is 71.18%. Comparing base (49b68a1) to head (05d0a1e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/io/mqtt/client/client.go	73.02%	12 Missing and 5 partials ⚠️
pkg/connection/connection_pool.go	88.43%	11 Missing and 3 partials ⚠️
internal/io/http/httpserver/websocketConn.go	61.29%	8 Missing and 4 partials ⚠️
internal/io/edgex/client/edgex.go	52.38%	7 Missing and 3 partials ⚠️
extensions/impl/sql/client/client.go	59.09%	6 Missing and 3 partials ⚠️
pkg/connection/connection_mock.go	71.43%	4 Missing ⚠️
pkg/nng/sock.go	73.33%	4 Missing ⚠️
internal/io/neuron/connector.go	62.50%	2 Missing and 1 partial ⚠️
extensions/impl/sql/sink.go	0.00%	2 Missing ⚠️
internal/binder/mock/mock_factory.go	0.00%	2 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3171      +/-   ##
==========================================
+ Coverage   71.16%   71.18%   +0.02%     
==========================================
  Files         385      385              
  Lines       43142    43187      +45     
==========================================
+ Hits        30698    30740      +42     
+ Misses      10020    10018       -2     
- Partials     2424     2429       +5     

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