feat(sdk): events

[matoous]

Adds typed event handling with signature verification, sync/async callbacks, and resource fetching.

def fallback(event: EventNotification) -> None:
  print("Unhandled event", event.id, event.type)

events = client.events_handler(secret, fallback)

@events.on_member_updated
def member_updated(event: MemberUpdatedEvent) -> None:
  member = event.fetch_object()
  print("Member updated", member.id)

events.handle(raw_body, signature_header)

Includes concise documentation and standalone Flask and FastAPI examples.