Support walltime limit in ScipyOptimizer

[dweindl]

SciPy optimizers don't support wall time limits directly. However, this can be achieved through callbacks. This is done here.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.22%. Comparing base (c5acea7) to head (dbabf08).

Files with missing lines	Patch %	Lines
pypesto/optimize/optimizer.py	92.85%	1 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1671      +/-   ##
===========================================
- Coverage    84.36%   83.22%   -1.14%     
===========================================
  Files          164      164              
  Lines        14320    14334      +14     
===========================================
- Hits         12081    11930     -151     
- Misses        2239     2404     +165     

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