Add method to start the node without tokio

Required for users without a `Runtime`, e.g. the bindings.

ref: https://github.com/bitcoindevkit/bdk-ffi/blob/master/bdk-ffi/src/kyoto.rs#L70

Author: rustaceanrob

src/lib.rs

@@ -141,6 +141,37 @@ impl LightClient<Idle> {
         };
         (client, requester, logging)
     }
+
+    /// Start the client on a detached operating system thread. This method is used when there is
+    /// no [`tokio::runtime::Runtime`] available.
+    ///
+    /// # Returns
+    ///
+    /// - A [`LightClient`] in [`Active`] state.
+    /// - A [`Requester`] to publish transactions or fetch data.
+    /// - [`LoggingSubscribers`] to process messages from the sync process.
+    pub fn start_detached_thread(mut self) -> (LightClient<Active>, Requester, LoggingSubscribers) {
+        let logging = core::mem::take(&mut self.logging).expect("node starts once");
+        let requester = core::mem::take(&mut self.requester).expect("node starts once");
+        let node = core::mem::take(&mut self.node).expect("node starts once");
+        std::thread::spawn(|| {
+            tokio::runtime::Builder::new_multi_thread()
+                .enable_all()
+                .build()
+                .unwrap()
+                .block_on(async move {
+                    let _ = node.run().await;
+                })
+        });
+        let client = LightClient {
+            requester: None,
+            logging: None,
+            update_subscriber: self.update_subscriber,
+            node: None,
+            _marker: core::marker::PhantomData,
+        };
+        (client, requester, logging)
+    }
 }
 
 impl LightClient<Active> {