Added function for arc length parameterization

[Aurora110104]

Added a function to curve_factory.py that takes in a curve, and returns an arc length parameterized version of this curve, using uniformly spaced samples and least square fit. The function will add more knots to the curve if needed. Also added a test function for this function to curve_factory_test.py.

[VikingScientist]

Too many commits. Squash them to a single one.

Also: The end change to Curve.py and Curve_test.py is two empty line additions; leftover from placing new functionality in one place and moving it later. Better to not touch the files at all in the final commit.

[Aurora110104]

Understood, I have squashed them now, and they should only change curve_factory.py and curve_factory_test.py.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.90476% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.02%. Comparing base (f3b9f3a) to head (23d0962).

Files with missing lines	Patch %	Lines
src/splipy/curve_factory.py	86.90%	5 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
+ Coverage   73.60%   74.02%   +0.41%     
==========================================
  Files          30       30              
  Lines        4982     5066      +84     
  Branches      828      844      +16     
==========================================
+ Hits         3667     3750      +83     
+ Misses       1105     1102       -3     
- Partials      210      214       +4     

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