SDK Update and Refactor

[DamienDeepgram]

Proposed changes

• Add streaming features
• Add support for pre-recorded features when streaming
• Add Speech to Text
• Refactor Code

Streaming Features

• endpointing
• utterance_end_ms
• interim_results
• no_delay
• vad_events

Streaming Functions

• keep_alive

New Streaming Message Types

• Utterance End
• Speech Started

Pre-Recorded Features

• encoding
• smart_format
• callback
• callback_method
• filler_words
• paragraphs
• diarize_version
• dictation
• measurements
• extra

Pre-Recorded Audio Intelligence Features

• detect_entities
• sentiment
• topics
• summarize
• intents
• custom_intents
• custom_intent_mode
• topics
• custom_topics
• custom_topic_mode

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update or tests (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING.md doc
• I have added tests and/or examples that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

Also considered a different approach with a SerializeStreamingOptions and have the code still just in case but this followed existing patterns

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[jcdyer]

A couple small requests. No need for a re-review.