Add a config file parameter "global_deformation" for the deformation

[sblauth]

This is set to False as default so that fenics.PETScDMCollection.create_transfer_matrix is as called as little as possible, as this function sometimes gives segfaults.

[codecov]

Codecov Report

Merging #348 (150e18c) into main (387b80e) will decrease coverage by 0.21%.
The diff coverage is 41.18%.

@@            Coverage Diff             @@
##             main     #348      +/-   ##
==========================================
- Coverage   92.50%   92.29%   -0.21%     
==========================================
  Files          84       84              
  Lines        6640     6643       +3     
==========================================
- Hits         6142     6131      -11     
- Misses        498      512      +14     

Files	Coverage Δ
cashocs/_optimization/line_search/line_search.py	96.88% <100.00%> (-3.12%)	⬇️
...n/shape_optimization/shape_optimization_problem.py	95.12% <100.00%> (+0.08%)	⬆️
cashocs/io/config.py	100.00% <ø> (ø)
cashocs/geometry/mesh_handler.py	90.00% <9.09%> (-3.82%)	⬇️

... and 1 file with indirect coverage changes

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