Implementation for livekit-plugins-neuphonic (TTS provider)

[adnansiddiquei]

This PR implements Neuphonic: https://neuphonic.com/ a TTS provider (I am an engineer at Neuphonic).

• Added livekit-plugins/livekit-plugins-neuphonic
• Added an example in examples/text-to-speech/neuphonic_tts.py
• Updated README to add Neuphonic to the TTS table.
• Update install_local.sh and install_plugins_editable.sh with Neuphonic.
• Added Neuphonic to the tests in tests/test_tts.py.

This PR does not do any of the following:

• Edit any of the github workflows
• Add any changesets.

Let me know which of those I should edit, and any other things I need to do! Or any further information required.

I have tested this locally using https://docs.livekit.io/agents/quickstarts/voice-agent/ by swapping out Cartesia TTS for Neuphonic TTS and it works.

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Latest commit: 61cefc4

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[adnansiddiquei]

All Neuphonic tests pass with pytest tests/test_tts.py

============================================================= test session starts =============================================================
platform darwin -- Python 3.12.4, pytest-8.3.4, pluggy-1.5.0
rootdir: /**/**/agents/tests
configfile: pytest.ini
plugins: asyncio-0.25.3, anyio-4.6.2.post1
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope="function"
collected 4 items                                                                                                                             

tests/test_tts.py::test_synthesize[neuphonic] PASSED                                                                                    [ 25%]
tests/test_tts.py::test_stream[neuphonic] PASSED    

[jayeshp19]

LGTM!

[adnansiddiquei]

Awesome, thank you! Let me know if there is anything else required on my end to get this merged in and released!

[jayeshp19]

Can we add update_options like this as well? I think it's ready to be merged after that

[adnansiddiquei]

Added an update_options function. Let me know if you'd like any other changes!

[adnansiddiquei]

Anything you need from me to get this onto the docs?

[jayeshp19]

Will add soon