Move DEFAULT_CHANNEL constant to QueueProviderInterface

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fix #253

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.59%. Comparing base (493a753) to head (1c857bb).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #256   +/-   ##
=========================================
  Coverage     98.59%   98.59%           
  Complexity      356      356           
=========================================
  Files            47       47           
  Lines           927      927           
=========================================
  Hits            914      914           
  Misses           13       13           

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