New extension for level set reinitialization

[maltezfaria]

This PR introduces a new extension, and the associated reinitialize! method, to set a given level-set to a signed distance function. It is based on:

1. Interpolating the grid-based level-set to create a continuous interpolant f. We currently use Interpolations for that purpose.
2. Sampling the zero curve of f
3. For each grid point y, perform some Newton iterations to minimise norm(x-y) subject to the equality constraint f(x) = 0

Follows the ideas presented this paper (with some minor tweaks). Not all the safeguards discussed there are currently implemented.

Closes #58

[codecov]

Codecov Report

❌ Patch coverage is 86.58537% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.61%. Comparing base (904acaf) to head (92a3012).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/MakieExt.jl	0.00%	5 Missing ⚠️
src/levelsetequation.jl	0.00%	5 Missing ⚠️
src/LevelSetMethods.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (904acaf) and HEAD (92a3012). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (904acaf)	HEAD (92a3012)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #65       +/-   ##
===========================================
- Coverage   77.27%   30.61%   -46.67%     
===========================================
  Files          12       14        +2     
  Lines         845      908       +63     
===========================================
- Hits          653      278      -375     
- Misses        192      630      +438     

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