feat(gui, tauri): Accept --testnet flag, default to mainnet (#106)

This PR tackles #92 

- Add the `tauri-plugin-cli` (only on desktop)
- Check in the frontend if the `--testnet` flag is set. If it's set we pass `testnet=true` to the `initialize_context` command on invokation
- We add the `vite-plugin-top-level-await` to allow top level await in all browsers
- Remove the `bitcoin_confirmation_target` from settings for simplicity

src-tauri/src/lib.rs

@@ -114,6 +114,9 @@ impl State {
 fn setup(app: &mut tauri::App) -> Result<(), Box<dyn std::error::Error>> {
     let app_handle = app.app_handle().to_owned();
 
+    #[cfg(desktop)]
+    app_handle.plugin(tauri_plugin_cli::init())?;
+
     // We need to set a value for the Tauri state right at the start
     // If we don't do this, Tauri commands will panic at runtime if no value is present
     app_handle.manage::<RwLock<State>>(RwLock::new(State::new()));
@@ -201,6 +204,7 @@ async fn is_context_available(context: tauri::State<'_, RwLock<State>>) -> Resul
 #[tauri::command]
 async fn initialize_context(
     settings: TauriSettings,
+    testnet: bool,
     app_handle: tauri::AppHandle,
     state: tauri::State<'_, RwLock<State>>,
 ) -> Result<(), String> {
@@ -213,13 +217,13 @@ async fn initialize_context(
     // Get app handle and create a Tauri handle
     let tauri_handle = TauriHandle::new(app_handle.clone());
 
-    let context_result = ContextBuilder::new(true)
+    let context_result = ContextBuilder::new(testnet)
         .with_bitcoin(Bitcoin {
-            bitcoin_electrum_rpc_url: settings.electrum_rpc_url,
-            bitcoin_target_block: settings.bitcoin_confirmation_target.into(),
+            bitcoin_electrum_rpc_url: settings.electrum_rpc_url.clone(),
+            bitcoin_target_block: None,
         })
         .with_monero(Monero {
-            monero_daemon_address: settings.monero_node_url,
+            monero_daemon_address: settings.monero_node_url.clone(),
         })
         .with_json(false)
         .with_debug(true)