Add mechanics submodule: SolidBody and SolidBodyPressure

[adtzlr]

fixes #215

[codecov-commenter]

Codecov Report

Merging #216 (baa9390) into main (2754b3a) will increase coverage by 0.01%.
The diff coverage is 98.70%.

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   98.24%   98.25%   +0.01%     
==========================================
  Files          62       66       +4     
  Lines        2614     2754     +140     
==========================================
+ Hits         2568     2706     +138     
- Misses         46       48       +2     

Impacted Files	Coverage Δ
felupe/_assembly/_axi.py	97.46% <66.66%> (-2.54%)	⬇️
felupe/__about__.py	100.00% <100.00%> (ø)
felupe/__init__.py	92.59% <100.00%> (+0.59%)	⬆️
felupe/constitution/_kinematics.py	94.54% <100.00%> (+0.92%)	⬆️
felupe/mechanics/__init__.py	100.00% <100.00%> (ø)
felupe/mechanics/_helpers.py	100.00% <100.00%> (ø)
felupe/mechanics/_solidbody.py	100.00% <100.00%> (ø)
felupe/mechanics/_solidbody_pressure.py	100.00% <100.00%> (ø)
felupe/mesh/_mesh.py	100.00% <100.00%> (ø)
felupe/tools/_save.py	100.00% <100.00%> (ø)

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