Add live props

Props can now refresh themselves when a broadcast event arrives. Always,
deferred, once and optional props gain live(), Inertia::live() creates a
live prop directly, and the page advertises each prop's channels, events
and throttle so the client can subscribe. Inertia::broadcastProps() lets
an event carry the new values itself, and DevTools flags live props.

Port of inertiajs/inertia-laravel#901 at 3.x e68dadfc16, with
inertiajs/docs#96 at main 8cfece18fd. The docs keep the client version
badges, mark live props as v3.11.0+, and leave out the Rails-only Action
Cable setup.

Hypervel adaptations:

- When an outgoing channel formatter is registered, live props advertise
  the formatted channels the broadcaster actually sends on, reading the
  channel type back from its prefix. Broadcaster::channelFormatter()
  exposes the registered formatter for this.
- Canceled requests are no longer turned into ordinary errors while
  reading event names and channels, rescuing deferred props, or reading
  and flushing DevTools entries. A canceled flush previously disabled
  DevTools recording for the worker.
- A rescued prop returned from a closure is now left out of the response
  with its metadata, as one resolved directly is. Upstream sent null and
  fresh live listeners for it.
- The broadcast values docs say that deferred and optional props are
  resolved, matching the code.

All upstream LivePropTest, BroadcastPropsTest and DevTools test changes
are ported, with regressions for formatted channels, cancellation and
closure-returned rescued props. The Inertia and Broadcasting suites,
facade docblock checks, analysis and formatting pass.

Author: binaryfire