Update-method of Mesh: Add optional points-argument

[adtzlr]

and make the cells argument also optional, changes

Mesh.update(cells, cell_type=None)`

to

Mesh.update(points=None, cells=None, cell_type=None)`

closes #522

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (754f2cf) 97.93% compared to head (2b79a64) 97.93%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #521   +/-   ##
=======================================
  Coverage   97.93%   97.93%           
=======================================
  Files          85       85           
  Lines        4020     4023    +3     
=======================================
+ Hits         3937     3940    +3     
  Misses         83       83           

Files Changed	Coverage Δ
src/felupe/mesh/_discrete_geometry.py	100.00% <100.00%> (ø)
src/felupe/region/_boundary.py	100.00% <100.00%> (ø)

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