feat: add enableAwareness option

[EastSun5566]

Description

Add the ability to disable awareness functionality on both client and server side. Default is enabled.

Usage

Client-side:

const provider = new SocketIOProvider(url, roomName, doc, {
  enableAwareness: false
})

Server-side:

const server = await registerYSocketIOServer(io, store, {
  ...otherOptions,
  enableAwareness: false 
})

[galaxian85]

@EastSun5566 請假，我幫他解 conflict

[stanley2058]

There's a TSC error:

src/y-socket-io/y-socket-io.js:475:50 - error TS2345: Argument of type 'Awareness | null' is not assignable to parameter of type 'Awareness'.
  Type 'null' is not assignable to type 'Awareness'.

475           AwarenessProtocol.applyAwarenessUpdate(existDoc.awareness, msg, null)
                                                     ~~~~~~~~~~~~~~~~~~


Found 1 error in src/y-socket-io/y-socket-io.js:475

y-socketio-redis/src/y-socket-io/y-socket-io.js

Lines 473 to 476 in a13c93e

	for (const msg of awareness) {
	if (msg.length === 0) continue
	AwarenessProtocol.applyAwarenessUpdate(existDoc.awareness, msg, null)
	}

Should be:

        if (existDoc.awareness) {
          for (const msg of awareness) {
            if (msg.length === 0) continue
            AwarenessProtocol.applyAwarenessUpdate(existDoc.awareness, msg, null)
          }
        }