Gpu support using cupy

[loganbvh]

No description provided.

[codecov]

Codecov Report

Merging #36 (147b784) into main (09d5e25) will decrease coverage by 1.15%.
The diff coverage is 76.20%.

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   89.39%   88.24%   -1.15%     
==========================================
  Files          35       37       +2     
  Lines        3810     4050     +240     
==========================================
+ Hits         3406     3574     +168     
- Misses        404      476      +72     

Files	Coverage Δ
setup.py	0.00% <ø> (ø)
tdgl/__init__.py	100.00% <100.00%> (ø)
tdgl/finite_volume/__init__.py	100.00% <ø> (ø)
tdgl/finite_volume/edge_mesh.py	92.68% <100.00%> (+0.18%)	⬆️
tdgl/finite_volume/util.py	98.23% <ø> (-0.04%)	⬇️
tdgl/solution/solution.py	88.28% <100.00%> (ø)
tdgl/solver/solve.py	100.00% <100.00%> (+24.18%)	⬆️
tdgl/sources/loop.py	50.00% <ø> (ø)
tdgl/version.py	85.71% <100.00%> (ø)
tdgl/visualization/io.py	96.96% <100.00%> (ø)
... and 8 more

... and 3 files with indirect coverage changes