Add PointLoad

[adtzlr]

fixes #264

[codecov-commenter]

Codecov Report

Merging #263 (0786b20) into main (6706049) will increase coverage by 0.00%.
The diff coverage is 96.87%.

@@           Coverage Diff           @@
##             main     #263   +/-   ##
=======================================
  Coverage   96.74%   96.74%           
=======================================
  Files          68       69    +1     
  Lines        2922     2953   +31     
=======================================
+ Hits         2827     2857   +30     
- Misses         95       96    +1     

Impacted Files	Coverage Δ
felupe/__init__.py	92.59% <ø> (ø)
felupe/mechanics/_pointload.py	96.66% <96.66%> (ø)
felupe/mechanics/__init__.py	77.77% <100.00%> (+2.77%)	⬆️
felupe/mechanics/_solidbody_gravity.py	100.00% <100.00%> (ø)

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