Add math-function for the right Cauchy-Green deformation tensor

[adtzlr]

This PR adds math.right_cauchy_green_deformation(field) as well as FieldContainer.evaluate.right_cauchy_green_deformation(). Furthermore, this also adds math.strain(field, C=None, ..., **kwargs) to use a given right Cauchy-Green deformation tensor for the evaluation of the strain tensor. In the docstring of RegionBoundary, an example is added to show the evaluation of the in-plane strain of faces.

compared to the max. principal strain of the volume

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.29%. Comparing base (8c46cdf) to head (3396a64).
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main     #898   +/-   ##
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  Coverage   97.28%   97.29%           
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  Files         171      171           
  Lines        6159     6166    +7     
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+ Hits         5992     5999    +7     
  Misses        167      167           

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