split_surface!() refactor

[kylebeggs]

Closes #32

• Increases the default number of neighbors to 10
• Requires split angle to be a Unitful.jl angle

[kylebeggs]

Might also take the time to do some optimizations here in the latter part of split_surface! such as in ranges_from_permutation. It is a bit naive.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/discretization/algorithms/fornberg_flyer.jl	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/WhatsThePoint.jl	100.00% <100.00%> (ø)
.../discretization/algorithms/vandersande_fornberg.jl	95.12% <100.00%> (ø)
src/surface_operations.jl	64.81% <100.00%> (+0.66%)	⬆️
src/discretization/algorithms/fornberg_flyer.jl	0.00% <0.00%> (ø)