Extension for Interpolants

[maltezfaria]

Add a new extension so that we can easily create a continuous function from the discrete values of the level set on the grid. Since the interpolants can be made sufficiently smooth (e.g. using cubic splines), one interesting idea would be to use this interpolant to curve a P1 mesh from MMG.

[codecov]

Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 21.44%. Comparing base (103e9cc) to head (cb03772).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/levelsetequation.jl	0.00%	3 Missing ⚠️
ext/InterpolationsExt.jl	77.77%	2 Missing ⚠️
ext/MMGVolumeExt.jl	0.00%	2 Missing ⚠️
src/meshes.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (103e9cc) and HEAD (cb03772). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (103e9cc)	HEAD (cb03772)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #50       +/-   ##
===========================================
- Coverage   79.29%   21.44%   -57.86%     
===========================================
  Files          11       12        +1     
  Lines         826      816       -10     
===========================================
- Hits          655      175      -480     
- Misses        171      641      +470     

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