[Feature Request][Flutter] Add Stroke Width

[rienkkk]

When using these icons with the flutter package, it is impossible to set a stroke width. It would be a great enhancement if this would be possible. I tried changing the code myself to get it working but was not able to.

Interesting starting point: there is a feather package for flutter which allows you to set the stroke width: https://github.com/vaetas/feather_icons_svg