picture: add into_data()

Author: hinto-janai

src/picture.rs

@@ -535,11 +535,16 @@ impl Picture {
 		self.description = description.map(Cow::from);
 	}
 
-	/// Returns the picture data
+	/// Returns the [`Picture`] data as borrowed bytes.
 	pub fn data(&self) -> &[u8] {
 		&self.data
 	}
 
+	/// Consumes a [`Picture`], returning the data as [`Vec`] without clones or allocation.
+	pub fn into_data(self) -> Vec<u8> {
+		self.data.into_owned()
+	}
+
 	/// Convert a [`Picture`] to a ID3v2 A/PIC byte Vec
 	///
 	/// NOTE: This does not include the frame header