register TextFont and TextColor in app type registry (#15950)

# Objective

`TextFont` and `TextColor` is not registered in the app type registry
and serializing a scene with a a `Text2d` doesn't save the color and
font of the text entity.

## Solution

register `TextFont`  and `TextColor`  in the type registry

crates/bevy_text/src/lib.rs

@@ -114,6 +114,8 @@ impl Plugin for TextPlugin {
     fn build(&self, app: &mut App) {
         app.init_asset::<Font>()
             .register_type::<Text2d>()
+            .register_type::<TextFont>()
+            .register_type::<TextColor>()
             .register_type::<TextSpan>()
             .register_type::<TextBounds>()
             .init_asset_loader::<FontLoader>()