add a default message handler

[maurerle]

alternative to OFFIS-DAI/mango#144

This logs exceptions in scheduled tasks correctly.
Related to #510

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.51%. Comparing base (5aa8a5c) to head (72bcf67).

Files with missing lines	Patch %	Lines
assume/world.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #511      +/-   ##
==========================================
- Coverage   76.53%   76.51%   -0.02%     
==========================================
  Files          51       51              
  Lines        6874     6878       +4     
==========================================
+ Hits         5261     5263       +2     
- Misses       1613     1615       +2     

Flag	Coverage Δ
pytest	76.51% <50.00%> (-0.02%)	⬇️

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[maurerle]

I would like to leave this open for now.

[maurerle]

will be closed as this is fixed in mango which was released today https://github.com/OFFIS-DAI/mango/releases/tag/v2.1.3