feat: add canBeUsed to TTSModule

src/modules/tts-modes/azure.ts

@@ -32,6 +32,10 @@ class AzureTTS implements TTSModule {
 
 		return { data: Buffer.concat(buffers) };
 	}
+
+	async canBeUsed(): Promise<boolean> {
+		return true;
+	}
 }
 
 export default new AzureTTS();

src/modules/tts-modes/google.ts

@@ -41,6 +41,10 @@ const ttsGoogle: TTSModule = {
 				resolve({ error: 'timed out' });
 			});
 		});
+	},
+
+	async canBeUsed(): Promise<boolean> {
+		return true;
 	}
 };