Fix Listener and ListenerContainer logger names

[pnuu]

This PR changes the logger names for Listener and ListenerContainer to be categorical, so prefixing them with posttroll.listener. so that the log messages are coming from posttroll.listener.Listener and posttroll.listener.ListenerContainer respectively.

Closes #67

[codecov]

Codecov Report

Attention: Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.63%. Comparing base (90ebc98) to head (efa3e36).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
posttroll/address_receiver.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   89.59%   89.63%   +0.03%     
==========================================
  Files          25       25              
  Lines        2278     2286       +8     
==========================================
+ Hits         2041     2049       +8     
  Misses        237      237              

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[gerritholl]

Looks good to me. Thank you for addressing this.