Avatar integration: add Avaluma avatar plugin

[Alpe6825]

Hi LiveKit team 👋

I'm from Avaluma, a real-time avatar provider. We've built a LiveKit Agents integration for our avatars and would like to contribute it upstream so Avaluma can sit alongside the other avatar providers in the docs.

What it is

A remote avatar plugin (livekit-plugins-avaluma) that follows the conventions of the existing avatar plugins (bey/tavus/anam/…):

• PEP 420 namespace package: from livekit.plugins.avaluma import AvatarSession
• Standard AvatarSession.start(agent_session, room, ...) API
• Audio via DataStreamAudioOutput with publish_on_behalf and wait_remote_track=KIND_VIDEO
• Agent/user turn-taking state forwarded to the avatar over RPC
• Ships py.typed, Apache-2.0 licensed

PR

I've opened a PR with the plugin, an example agent, and the extras / workspace / lock wiring. It passes ruff check, ruff format --check, and mypy --strict.

Happy to

• sign the CLA,
• align the version with the monorepo's release scheme,
• coordinate the PyPI publish under the LiveKit org,
• provide test credentials / a demo so you can validate the integration,
• and add the docs page for the avatar integrations list.

Thanks!