Type alias ProviderEventType
ProviderEventType: "joining" | "waiting_room" | "in_call" | "notice_posted" | "monitor_heartbeat" | "participant_joined" | "participant_left" | "chat_message" | "stop_command" | "capture_started" | "capture_suspended" | "left" | "done" | "crashed" | "usage" | "error"
What a provider reports, after its parser normalised it.