Add `Sized` bound to `StyledExt` trait (#3309)

This PR moves the `Sized` bound to the `StyledExt` trait so we don't
have to repeat it on each of the methods.

Release Notes:

- N/A
71790b338bMarshall Bowers committed on 11/13/2023, 4:22:49 PM· committed by GitHubparentsbe8bd433654dd8
2 files changedLine totals unavailable