Add support for importing SVG, PNG, and JPEG files directly

[Mrtenz]

This adds support for importing SVG, PNG, and JPEG files directly in a Snap. For example, you can now use this:

import file from './path/to/image.png';

And use that image in a snap UI using the image component:

content: image(file)

Internally the image is converted to an SVG string by the CLI, which makes this possible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (2933da0) to head (26840af).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2284   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files         337      337           
  Lines        7622     7629    +7     
  Branches     1183     1186    +3     
=======================================
+ Hits         7363     7370    +7     
  Misses        259      259           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[FrederikBolding]

Could we use some other example than this icon we are trying to remove? 😅