Add `font_style` and `font_weight` to serialized theme representation (#6838)

This PR adds `font_style` and `font_weight` as fields on the
`HighlightStyleContent` used in the serialized theme representation.

Release Notes:

- N/A
536a4ab87aMarshall Bowers committed on 1/27/2024, 3:40:31 AM· committed by GitHubparentfd3c96d
4 files changedLine totals unavailable