add editor restrictions + example

set_text does not respect these limits, unsure of best way to implement them in that function. Think it's object oriented brain biting me here, need to reframe the issue

examples/restricted_input.rs

+use bevy::prelude::*;
+use bevy_cosmic_edit::{
+    change_active_editor_sprite, change_active_editor_ui, ActiveEditor, CosmicAttrs,
+    CosmicEditPlugin, CosmicEditUiBundle, CosmicMaxChars, CosmicMaxLines, CosmicMetrics,
+};
+use cosmic_text::{Attrs, AttrsOwned};
+
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2dBundle::default());
+
+    let attrs = AttrsOwned::new(Attrs::new().color(cosmic_text::Color::rgb(69, 69, 69)));
+
+    let editor = commands
+        .spawn(CosmicEditUiBundle {
+            style: Style {
+                // Size and position of text box
+                width: Val::Percent(20.),
+                height: Val::Px(50.),
+                left: Val::Percent(40.),
+                top: Val::Px(100.),
+                ..default()
+            },
+            cosmic_attrs: CosmicAttrs(attrs.clone()),
+            cosmic_metrics: CosmicMetrics {
+                font_size: 16.,
+                line_height: 16.,
+                ..Default::default()
+            },
+            max_chars: CosmicMaxChars(15),
+            max_lines: CosmicMaxLines(1),
+            ..default()
+        })
+        .id();
+
+    commands.insert_resource(ActiveEditor {
+        entity: Some(editor),
+    });
+}
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(CosmicEditPlugin::default())
+        .add_systems(Startup, setup)
+        .add_systems(Update, change_active_editor_ui)
+        .add_systems(Update, change_active_editor_sprite)
+        .run();
+}