Codec update

[jsagerOffis]

Auto-generate type_id in codecs and allow manual setting of type_id when registering a serializer.

closes #149

[codecov]

Codecov Report

Attention: Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.11%. Comparing base (4c05dac) to head (f44640c).
Report is 8 commits behind head on development.

Files with missing lines	Patch %	Lines
mango/messages/codecs.py	93.54%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #155      +/-   ##
===============================================
+ Coverage        89.03%   89.11%   +0.08%     
===============================================
  Files               22       22              
  Lines             2471     2490      +19     
===============================================
+ Hits              2200     2219      +19     
  Misses             271      271              

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