[FEAT] Consider using fonts instead of raw/embedded SVGs

[sadespresso]

Is your feature request related to a problem? Please describe.
It would be really nice to have Iconoir fonts rather than CSS with embedded SVGs, or multiple Dart classes.

Generally, fonts have smaller file size, and is the norm for quite many popular fonts (i.e., Material Symbols, FontAwesome)

Describe the solution you'd like
Generate a font, and generate CSS, and Dart classes (one like Icons) with codepoints.

You can generate fonts from SVG files with tools like fantasticon.

It's just another way to do the thing, and this issue is a suggestion 😅

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[sadespresso]

So I have generated fonts using fantasticon. Had to run it thru svg-fixer to convert strokes to fills.

If this aligns with the direction of the project, I can make PR and write generators for all the packages.

See latest code at: https://github.com/sadespresso/iconoir