[Font Library] Google fonts collection: generate SVG previews and add them to the list

[matiasbenedetto]

To improve the performance of the frontend loading of the fonts list coming from a collection like the Google Fonts one, we would need to create SVG previews of the font families.

More context:

• Font Library: where to store the list of Google Fonts? #52795

Links:

• [Tracking] Font Library. Stage 2: Fonts Library extensions #53307
• [Tracking] Font Library. Stage 3: UI, UX and performance improvements #53926

[matiasbenedetto]

The SVG preview generation is working on this prototype:
https://github.com/matiasbenedetto/google-fonts-to-wordpress-collection/
If it looks somewhat OK, we would need to find a right place to store that repo.

[mikachan]

I believe this can be closed with #54566, please re-open if necessary!