Adding UtteranceEnd support for Deepgram

[hackyon]

Adding support for UtteranceEnd to Deepgram agent plugin. The UtteranceEnd is another feature offered by Deepgram to detect end of speech.

The Deepgram documentation is here: https://developers.deepgram.com/docs/utterance-end

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Latest commit: 90ab6cd55f5620a0f707306d74b6dd74a8c83423

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