Handle OpenAI /audio/speech route

[narengogi]

Description:

• Added new route and handler for /audio/speech

Related Issues:

• Support Audio Routes #488

Testing Done

• Generated audio in all the supported formats for /audio/speech
• Error Response Handling for /audio/speech
• Verified that the response stream is sent as is

client = OpenAI(
    base_url="http://localhost:8787/v1",
    api_key="",
    default_headers=createHeaders(
        provider="openai",
    )
)

response = client.audio.with_streaming_response.speech.create(
    model="tts-1",
    voice="alloy",
    input=(
        "Once upon a time, in a quaint village nestled among rolling hills, there lived a curious young girl named Lily. "
        "She had always dreamed of adventure beyond the confines of her small town. One day, while exploring the attic "
        "of her grandmother's old house, Lily discovered a dusty, leather-bound book with strange symbols on its cover. "
        "As she opened it, a swirl of glittering dust escaped, and she found herself transported to a magical realm "
        "filled with talking animals, floating islands, and shimmering forests. Lily embarked on an epic journey, "
        "making friends with a wise owl, a mischievous fox, and a brave knight along the way. Together, they faced "
        "challenges, solved riddles, and ultimately saved the magical realm from an evil sorcerer who sought to plunge "
        "it into eternal darkness. Through her adventures, Lily learned the value of friendship, courage, and the power "
        "of believing in oneself. When she finally returned home, Lily realized that the greatest adventures often begin "
        "with a single step into the unknown, and that magic exists everywhere if you know where to look. "
        "As the years passed, Lily grew older, but she never forgot her magical adventure. She became a storyteller, "
        "sharing tales of wonder and imagination with children in her village. Her stories inspired a new generation "
        "of dreamers and adventurers, each eager to find their own magical realms. And though she never found that "
        "mysterious book again, Lily knew that the real magic had always been within her heart, waiting to be discovered."
    ),
)

with response as streaming_response:
    streaming_response.stream_to_file("output.mp3")

TODO

• Test .pcm format in /audio/speech route

used `ffplay  -autoexit -f s16le  ~/Documents/generated-speech/fox.pcm` to play file

[VisargD]

Please fix this log

[VisargD]

speech handler should also be added for azure-openai

[narengogi]

Changes now in #538