events: start moving towards a more control-handle based task architecture

src/tts.rs

@@ -1,6 +1,17 @@
 use std::process::Command;
 
-pub async fn start_tts() -> tokio::sync::mpsc::Sender<String> {
+#[derive(Debug)]
+pub struct TtsControl {
+    request_sink: tokio::sync::mpsc::Sender<String>
+}
+
+impl TtsControl {
+    pub async fn speak(&self, text: String) {
+        self.request_sink.send(text).await.unwrap();
+    }
+}
+
+pub async fn start_tts() -> TtsControl {
 
     let (tts_request_sender, mut tts_request_receiver) = tokio::sync::mpsc::channel(3);
 
@@ -12,5 +23,7 @@ pub async fn start_tts() -> tokio::sync::mpsc::Sender<String> {
         }
     });
 
-    tts_request_sender
+    TtsControl {
+        request_sink: tts_request_sender
+    }
 }