Amazon Transcribe streaming & custom vocabularies

[JGoutin]

Extend the Amazon Transcribe integration with:

Streaming transcription

Real-time streaming transcription via Amazon Transcribe streaming API, exposed on POST /v1/audio/transcriptions with a streaming response.

Custom vocabularies

Allow users to specify a custom vocabulary name in transcription requests to improve accuracy for domain-specific terminology.

REF:

• https://docs.aws.amazon.com/transcribe/latest/dg/streaming.html
• https://docs.aws.amazon.com/transcribe/latest/dg/custom-vocabulary.html