Introduce selector flag and decouple iced_widget from iced_runtime

runtime/src/widget/selector.rs

@@ -0,0 +1,18 @@
+//! Find and query widgets in your applications.
+pub use iced_selector::Selector;
+
+pub use iced_selector::target::{Bounded, Match, Target, Text};
+
+use crate::Task;
+use crate::core::widget;
+use crate::task;
+
+/// Finds a widget by the given [`widget::Id`].
+pub fn find_by_id(id: impl Into<widget::Id>) -> Task<Option<Match>> {
+    task::widget(id.into().find())
+}
+
+/// Finds a widget that contains the given text.
+pub fn find_by_text(text: impl Into<String>) -> Task<Option<Text>> {
+    task::widget(Selector::find(text.into()))
+}