fix: Add participant_disconnect and unlink methods, to reconnect human input

[brightsparc]

Fixes: #1124

This adds new method to disconnect a participant and refactors the inner methods to be class level.

• May want to review diff without whitespace since I've moved some internal methods up a level
• The type checking required me to explicitly reference vad.VADEvent and stt.SpeechEvent

cc @theomonnom

[changeset-bot]

🦋 Changeset detected

Latest commit: fcca167

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
livekit-agents	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[brightsparc]

Thanks @theomonnom, could we get this merged so it makes it into the next release?

[theomonnom]

Hey @brightsparc, probably sometimes this week, we're thinking about reworking this flow a bit