Add sample rate configuration for audio devices

[uezo]

Add support for configuring input and output sample rates in AIAvatar

This update enables users to specify custom sample rates for both input and output audio devices, as demonstrated in the AIAvatar initialization. This feature provides greater flexibility in handling different audio specifications and enhances compatibility with various hardware.

app = AIAvatar(
    openai_api_key=OPENAI_API_KEY,
    google_api_key=GOOGLE_API_KEY,
    input_sample_rate=48000,
    output_sample_rate=44100
)