feat: add support for multiple font axes

[LazyTechwork]

Hello! I use Open Sans variable font in my projects and investigated that google-fonts-helper can't correctly work with them. For example I can't get Open Sans Condensed (wdth axis = 75). I made some refactorings in code to create ability to use several axis.

I'm not sure about 100% compatibility, but all existing tests pass.

About huge diff in src/google-fonts-metadata.ts... I have some gaps in my knowledge of TS, so if there are other ways to add the ability to use other axes in all fonts at the same time, I’d be glad to see!

Resolve #66

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 3.40%. Comparing base (3df2f95) to head (7e2d83d).
Report is 4 commits behind head on main.

Files	Patch %	Lines
scripts/generate-types.js	0.00%	11 Missing ⚠️
src/construct-url.ts	96.82%	2 Missing ⚠️
src/utils.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #68      +/-   ##
========================================
- Coverage   3.89%   3.40%   -0.49%     
========================================
  Files         11      11              
  Lines      15780   17346    +1566     
  Branches     150     148       -2     
========================================
- Hits         614     590      -24     
- Misses     15164   16754    +1590     
  Partials       2       2              

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[ricardogobbosouza]

Thanks @LazyTechwork
Sorry for the delay....
I added other axes in src/google-fonts-metadata.ts