Add TextStream support to SpeechSynthesizer in the JavaScript SDK

[balloob]

Is your feature request related to a problem? Please describe.

Same request as #2773, but for JavaScript: I want to be able to stream output from LLMs to Azure and get text going as soon as possible without having to wait for the full response.

Describe the solution you'd like

Allow streaming in LLM output tokens with speak_async and tts_request.input_stream.write into the Speech Synthesizer and start generating text as soon as possible.

Describe alternatives you've considered

Python SDK

Additional context
Same as #2773

[balloob]

@pankopon @yulin-li is there a place where I can see the in-review code? Or is that happening on an internal branch?

[github-actions]

This item has been open without activity for 19 days. Provide a comment on status and remove "update needed" label.

[balloob]

I am still waiting for the review of this feature to pass and it to be publicly available.

[github-actions]

This item has been open without activity for 19 days. Provide a comment on status and remove "update needed" label.

[balloob]

I am still waiting for the review of this feature to pass and it to be publicly available.

[github-actions]

This item has been open without activity for 19 days. Provide a comment on status and remove "update needed" label.

[balloob]

I am still waiting for the review of this feature to pass and it to be publicly available.