Implement Speaker Class for Agent API for Local Laptop

[davidvonthenen]

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Proposed changes

There is a provided Microphone class that was provided in the first release of v4 of this SDK for people to do STT locally on their laptop: https://www.nuget.org/packages/Deepgram.Microphone

It would be nice also to have one for a Speaker class similar to Python here: https://github.com/deepgram/deepgram-python-sdk/blob/main/deepgram/audio/speaker/speaker.py

This is not trivial work, but some of the code from the Microphone implementation using portaudio can be leveraged: https://github.com/deepgram/deepgram-dotnet-sdk/tree/main/Deepgram.Microphone

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