feat(ext): restore zmq source/sink

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 8.24742% with 89 lines in your changes missing coverage. Please review.

Project coverage is 67.47%. Comparing base (bf665da) to head (73a5cc3).
Report is 2 commits behind head on master.

Files	Patch %	Lines
extensions/impl/zmq/source.go	0.00%	49 Missing ⚠️
extensions/impl/zmq/sink.go	0.00%	36 Missing ⚠️
extensions/sinks/zmq/zmq.go	0.00%	2 Missing ⚠️
extensions/sources/zmq/zmq.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3039      +/-   ##
==========================================
- Coverage   67.70%   67.47%   -0.23%     
==========================================
  Files         357      362       +5     
  Lines       34969    35049      +80     
==========================================
- Hits        23674    23648      -26     
- Misses       9172     9280     +108     
+ Partials     2123     2121       -2     

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