Fix issue with join_video/audio_muted and local streams + type fixes

[framini]

The code in this changeset includes:

• Fix issue with local stream being active when the user joined with join_video_muted: true or join_audio_muted: true
• Fix typing for meta (it's marked as optional on the BE)
• Added members to VideoRoomSessionContract and made it optional in RoomSessionFullState for realtime-api

[changeset-bot]

🦋 Changeset detected

Latest commit: 7ff461d

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

This PR includes changesets to release 6 packages

Name	Type
@signalwire/core	Patch
@signalwire/js	Patch
@signalwire/realtime-api	Patch
@signalwire/react-native	Patch
@signalwire/web-api	Patch
@signalwire/webrtc	Patch

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