Enhance Mesh: Mesh tools as methods

[adtzlr]

A more object-oriented Mesh

• rename old Mesh to DiscreteGeometry
• create Mesh on top of DiscreteGeometry
• add all mesh-related tools as methods to the new Mesh class

closes #424

This enables

import felupe as fem

fem.Rectangle(n=5).expand(n=4, z=1)

in addition to the still useful but sometimes very lengthy code

import felupe as fem

rect = fem.Rectangle(n=5)
cube = fem.mesh.expand(rect, n=4, z=1)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (b526111) 97.76% compared to head (5053cc1) 97.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
+ Coverage   97.76%   97.79%   +0.03%     
==========================================
  Files          80       81       +1     
  Lines        3663     3720      +57     
==========================================
+ Hits         3581     3638      +57     
  Misses         82       82              

Impacted Files	Coverage Δ
src/felupe/mesh/_convert.py	96.39% <100.00%> (ø)
src/felupe/mesh/_discrete_geometry.py	100.00% <100.00%> (ø)
src/felupe/mesh/_helpers.py	100.00% <100.00%> (ø)
src/felupe/mesh/_mesh.py	100.00% <100.00%> (ø)
src/felupe/mesh/_tools.py	100.00% <100.00%> (ø)

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