Add global options setter & enable join 'override'

[FabianHofmann]

• enable 'override' option if LinearExpression's are of the same shape
• add config.py

[codecov]

Codecov Report

Base: 89.38% // Head: 89.45% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (22907cb) compared to base (e16a804).
Patch coverage: 94.53% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   89.38%   89.45%   +0.06%     
==========================================
  Files          13       14       +1     
  Lines        2582     2673      +91     
  Branches      396      414      +18     
==========================================
+ Hits         2308     2391      +83     
- Misses        195      199       +4     
- Partials       79       83       +4     

Impacted Files	Coverage Δ
linopy/variables.py	91.64% <88.00%> (-0.61%)	⬇️
linopy/expressions.py	88.67% <91.66%> (-0.12%)	⬇️
linopy/common.py	93.13% <92.85%> (-0.55%)	⬇️
linopy/__init__.py	100.00% <100.00%> (ø)
linopy/config.py	100.00% <100.00%> (ø)
linopy/constraints.py	94.56% <100.00%> (+0.19%)	⬆️
linopy/solvers.py	87.06% <0.00%> (-0.64%)	⬇️
linopy/monkey_patch_xarray.py	94.44% <0.00%> (+11.11%)	⬆️

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