optional arg in initialize to avoid creating network io

[kafonek]

Little flag to make testing easier. await mgr.initialize(enable_polling=False) will start the inbound and outbound queue workers, but not the poll worker. That way your backend won't start making IO connections, and you can test registered callbacks that use .send by asserting ._publish was called while triggering the callbacks using .schedule_for_delivery.

[kafonek]

Current dependencies on/for this PR:

• main
  • PR drop websocket logging level #26
    • PR make websockets backend use sync .send like base #27
      • PR optional arg in initialize to avoid creating network io #28 👈

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[codecov-commenter]

Codecov Report

Merging #28 (53d2eba) into main (4164ef7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage   95.46%   95.47%           
=======================================
  Files           8        8           
  Lines         463      464    +1     
=======================================
+ Hits          442      443    +1     
  Misses         21       21           

Impacted Files	Coverage Δ
sending/base.py	94.49% <100.00%> (+0.02%)	⬆️

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