Expose Script.to_bytes() method

bdk-ffi/src/bdk.udl

@@ -496,4 +496,6 @@ enum WitnessVersion {
 
 interface Script {
   constructor(sequence<u8> raw_output_script);
+
+  sequence<u8> to_bytes();
 };

bdk-ffi/src/lib.rs

@@ -438,6 +438,10 @@ impl Script {
         let script: BdkScript = BdkScript::from(raw_output_script);
         Script { script }
     }
+
+    fn to_bytes(&self) -> Vec<u8> {
+        self.script.to_bytes()
+    }
 }
 
 impl From<BdkScript> for Script {