Add cosmic-text as an option for the text renderer

[ids1024]

Cosmic-text is still changing somewhat rapidly, but should provide a way to handle RTL/bidir/etc text with proper shaping. So I thought I'd try adding support for it here.

This isn't quite working right when I try it with Arabic text (maybe partly that it needs alpha blending when compositing glyphs?). And it needs to request the right font.

[Friz64]

Self-requesting review, due to https://github.com/bevyengine/bevy/pull/10193 landing (soon?)