Add to_qr_uri() method on Address type

bdk-ffi/src/bdk.udl

@@ -440,6 +440,8 @@ interface Address {
   Network network();
 
   Script script_pubkey();
+
+  string to_qr_uri();
 };
 
 [Enum]

bdk-ffi/src/lib.rs

@@ -381,6 +381,10 @@ impl Address {
             script: self.address.script_pubkey(),
         })
     }
+
+    fn to_qr_uri(&self) -> String {
+        self.address.to_qr_uri()
+    }
 }
 
 /// The method used to produce an address.