perf(flat-stores): fetch users info only when necessary

[hyrious]

New RTM commands @netless-io/native

Broadcast Command "enter": Tell everyone in the room your basic info (name, avatar, rtcUID); pick up to 3 peers to tell you everyone else's info, see the next command.

onJoinRoom((rtm) => {
    rtm.sendRoomCommand("enter", {
        roomUUID: this.roomUUID,
        userUUID: user.userUUID,
        userInfo: {
            name: user.name,
            avatarURL: user.avatar,
            rtcUID: +user.rtcUID || 0,
        },
        peers: sampleSize(rtm.members, 3),
    })
})

onRoomCommand("enter", ({ userUUID, userInfo }) => {
    usersStore.cacheUser(userUUID, userInfo)
})

Disabled "users-info" command for now because of the limitation of RTM

Peer Command "users-info": Tell someone all of the local users' info.

onRoomCommand("enter", ({ userUUID: senderID, peers }) => {
    if (peers.includes(this.userUUID)) {
        rtm.sendPeerCommand("users-info", {
            roomUUID: this.roomUUID,
            users: getAllLocalUsers(),
        }, senderID)
    }
})

// The return value is the same as the /room/info/users server API.
declare function getAllLocalUsers(): {
    [userUUID: string]: {
        rtcUID: number,
        name: string,
        avatarURL: string,
    }
}

onPeerCommand("users-info", ({ users }) => {
    usersStore.cacheUsers(users)
})