Redis driver support

[vitalyrotari]

Hello comrades,

Here is Redis driver implementation for roomcaches, the main reason was to support a big number of CCU in our project. MongoDB and MySql are not so good for this, so we decide to create this driver.

We are glad to share it with the Colyseus community because you make a great job :)

How to use:

import { Server, RedisPresence } from "colyseus";
import { RedisDriver } from "colyseus/lib/matchmaker/drivers/RedisDriver"

const redisConfig = {
  url: process.env.REDIS_URL || 'redis://127.0.0.1:6379/0',
  prefix: process.env.REDIS_PREFIX || 'colyseus:',
};

const gameServer = new Server({
  // ...
  presence: new RedisPresence(redisConfig),
  driver: new RedisDriver(redisConfig),
});