Initial implementation of TTS with Web Speech API (#120)

* Initial implementation of TTS with Web Speech API

* Add translations for annotator tools

apps/readest-app/src/utils/queue.ts

@@ -0,0 +1,39 @@
+export class AsyncQueue<T> {
+  private queue: T[] = [];
+  private resolves: ((value: void) => void)[] = [];
+  private done = false;
+
+  enqueue(item: T) {
+    this.queue.push(item);
+    if (this.resolves.length > 0) {
+      const resolve = this.resolves.shift();
+      resolve?.();
+    }
+  }
+
+  finish() {
+    this.done = true;
+    while (this.resolves.length > 0) {
+      const resolve = this.resolves.shift();
+      resolve?.();
+    }
+  }
+
+  async dequeue(): Promise<T | null> {
+    if (this.queue.length > 0) {
+      return this.queue.shift()!;
+    }
+    if (this.done) {
+      return null;
+    }
+    return new Promise<T | null>((resolve) => {
+      this.resolves.push(() => {
+        if (this.queue.length > 0) {
+          resolve(this.queue.shift()!);
+        } else {
+          resolve(null);
+        }
+      });
+    });
+  }
+}