Removed split/collapse from Mesh and customized Tri/Tet split/collapse

[mtao]

Split/collapse don't belong in the base mesh implementation as they are not atomic operations for all mesh types.
Instead each class (like TriMesh/TetMesh) is responsible for having its own member function for atomic operations.
Atomic operations also now return some sort of metadata (currently for the aforementioend types/operations some sort of EdgeOperationData).

[codecov]

Codecov Report

Merging #429 (3f240eb) into main (19ec160) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
+ Coverage   81.88%   81.95%   +0.07%     
==========================================
  Files         154      154              
  Lines        4156     4162       +6     
==========================================
+ Hits         3403     3411       +8     
+ Misses        753      751       -2     

Flag	Coverage Δ
wildmeshing	81.95% <100.00%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/wmtk/Mesh.hpp	94.44% <ø> (ø)
src/wmtk/PointMesh.hpp	25.00% <ø> (+8.33%)	⬆️
src/wmtk/TetMesh.cpp	86.34% <100.00%> (+0.09%)	⬆️
src/wmtk/TetMesh.hpp	100.00% <ø> (ø)
src/wmtk/TetMeshOperationExecutor.cpp	93.88% <100.00%> (-0.03%)	⬇️
src/wmtk/TriMesh.cpp	93.04% <100.00%> (+0.06%)	⬆️
src/wmtk/TriMesh.hpp	100.00% <ø> (ø)
src/wmtk/TriMeshOperationExecutor.cpp	96.51% <100.00%> (ø)
src/wmtk/operations/tet_mesh/EdgeOperationData.hpp	100.00% <100.00%> (ø)
src/wmtk/operations/tri_mesh/EdgeCollapse.cpp	78.72% <100.00%> (+0.94%)	⬆️
... and 2 more