Add len() and is_empty() to GString

Author: Bromeon

godot-core/src/builtin/string/gstring.rs

@@ -68,6 +68,14 @@ impl GString {
         Self { opaque }
     }
 
+    pub fn len(&self) -> usize {
+        self.as_inner().length().try_into().unwrap()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.as_inner().is_empty()
+    }
+
     /// Returns a 32-bit integer hash value representing the string.
     pub fn hash(&self) -> u32 {
         self.as_inner()