Move types, clean imports, move interpolate method

[HarelM]

Launch Checklist

This PR is mainly a refactoring of exiting code.
There were some classes that were placed in utils instead of types folder.
I moved the code around to fix that.
Also removed the deprecated interpolation factory.
I moved the imports to be at the begging of the file where I saw that this was not the case.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.64706% with 10 lines in your changes missing coverage. Please review.

Project coverage is 92.79%. Comparing base (89713fd) to head (7efa923).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/expression/types/color.ts	84.84%	5 Missing ⚠️
src/expression/definitions/interpolate.ts	77.77%	4 Missing ⚠️
src/expression/index.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #903      +/-   ##
==========================================
+ Coverage   92.73%   92.79%   +0.05%     
==========================================
  Files         105      105              
  Lines        4683     4689       +6     
  Branches     1323     1323              
==========================================
+ Hits         4343     4351       +8     
+ Misses        340      338       -2     

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[HarelM]

@birkskyum I believe you are familiar with most of the code changes here.
Let me know if something here is not clear.

[birkskyum]

it reminded me of something - wonder if they're equally fast.
https://github.com/maplibre/maplibre-gl-js/blob/3d318e80220d083a960051e8601b107ce3f4ee77/src/util/util.ts#L210-L218

[birkskyum]

Will try to bench the two lerps against each other at some point - for the fun of it :)

[birkskyum]

Thanks, this is definitely better