Add OnlineWallet::getNetwork

src/bdk.udl

@@ -94,4 +94,5 @@ interface BlockchainConfig {
 interface OnlineWallet {
     [Throws=BdkError]
     constructor(string descriptor, Network network, DatabaseConfig database_config, BlockchainConfig blockchain_config);
+    Network get_network();
 };

src/lib.rs

@@ -117,6 +117,10 @@ impl OnlineWallet {
         )?);
         Ok(OnlineWallet { wallet })
     }
+
+    fn get_network(&self) -> Network {
+        self.wallet.lock().unwrap().network()
+    }
 }
 
 uniffi::deps::static_assertions::assert_impl_all!(OfflineWallet: Sync, Send);