Rewrite input streaming

[ajar98]

Rewrite input streaming to be built more bespoke into StreamingConversation:

• Convert BaseSynthesizer into a worker that accepts
• Convert the process of collating tokens into sentences into a worker (that doesn't include a queue) that is attached to an Agent only if the attached synthesizer is an input streaming synthesizer
• Rename create_speech_uncached to create_speech (less confusing)

Allows us to dramatically improve the code quality of input streaming and also dramatically simplify agent / synthesizer abstractions

[ss14]

Hi @ajar98

I have raised an issue #668 about a failing test case. IMO that issue may be fixed after this input streaming rewrite is complete. Let me know you opinion. thanks!

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