Add some utils fns, add moshi to cookbook, fix querySelector, support async functions in ReplyOnPause (#29)

* add

* add code

docs/utils.md

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+# Utils
+
+## `audio_to_bytes`
+
+Convert an audio tuple containing sample rate and numpy array data into bytes.
+Useful for sending data to external APIs from `ReplyOnPause` handler.
+
+Parameters
+```
+audio : tuple[int, np.ndarray]
+    A tuple containing:
+        - sample_rate (int): The audio sample rate in Hz
+        - data (np.ndarray): The audio data as a numpy array
+```
+
+Returns
+```
+bytes
+    The audio data encoded as bytes, suitable for transmission or storage
+```
+
+Example
+```python
+>>> sample_rate = 44100
+>>> audio_data = np.array([0.1, -0.2, 0.3])  # Example audio samples
+>>> audio_tuple = (sample_rate, audio_data)
+>>> audio_bytes = audio_to_bytes(audio_tuple)
+```
+
+## `audio_to_file`
+
+Save an audio tuple containing sample rate and numpy array data to a file.
+
+Parameters
+```
+audio : tuple[int, np.ndarray]
+    A tuple containing:
+        - sample_rate (int): The audio sample rate in Hz
+        - data (np.ndarray): The audio data as a numpy array
+```
+Returns
+```
+str
+    The path to the saved audio file
+```
+Example
+```
+```python
+>>> sample_rate = 44100
+>>> audio_data = np.array([0.1, -0.2, 0.3])  # Example audio samples
+>>> audio_tuple = (sample_rate, audio_data)
+>>> file_path = audio_to_file(audio_tuple)
+>>> print(f"Audio saved to: {file_path}")
+```