Introduce write method to Clipboard trait

native/src/clipboard.rs

@@ -3,4 +3,7 @@
 pub trait Clipboard {
     /// Reads the current content of the [`Clipboard`] as text.
     fn read(&self) -> Option<String>;
+
+    /// Writes the given text contents to the [`Clipboard`].
+    fn write(&mut self, contents: String);
 }