Add SolidBodyTensor

[adtzlr]

in order to support materials with state variables.

[codecov-commenter]

Codecov Report

Merging #224 (a2664f1) into main (a8d614d) will decrease coverage by 0.09%.
The diff coverage is 94.20%.

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   98.26%   98.16%   -0.10%     
==========================================
  Files          66       67       +1     
  Lines        2767     2836      +69     
==========================================
+ Hits         2719     2784      +65     
- Misses         48       52       +4     

Impacted Files	Coverage Δ
felupe/__init__.py	92.59% <ø> (ø)
felupe/mechanics/_solidbody_tensor.py	93.65% <93.65%> (ø)
felupe/mechanics/__init__.py	100.00% <100.00%> (ø)
felupe/tools/_post.py	100.00% <100.00%> (ø)

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