simulateLatency doesn't go back

[endel]

Reported by Cucumba on Discord

---

Server latency simulation bug as previously mentioned here ⁠🐛│bugs⁠
https://github.com/colyseus/colyseus/blob/0.15/packages/core/src/Server.ts#L239
https://github.com/colyseus/colyseus/blob/0.15/packages/transport/ws-transport/src/WebSocketTransport.ts#L73
https://github.com/colyseus/colyseus/blob/0.15/packages/transport/uwebsockets-transport/src/uWebSocketsTransport.ts#L124
Reason: previous function is being overridden each time when simulateLatency is called, it sets timeout for existing timeout, instead of original function

Here is example:

class Logger {
    log(message) {
        console.log(message)
    }
}

function simulateLatency(milliseconds) {
    const previousLog = Logger.prototype.log
    Logger.prototype.log = function(...args) {
        console.warn(milliseconds)
        setTimeout(() => previousLog.apply(this, args), milliseconds);
    }
}

const logger = new Logger()
logger.log("msg") // no delay

simulateLatency(1000)
logger.log("msg") // delay 1 second

simulateLatency(0)
logger.log("msg") // delay 1 second

simulateLatency(1000)
simulateLatency(1000)
simulateLatency(1000)
logger.log("msg") // delay 4 seconds

[afrokick]

I fixed it in #663 + some test cases have been added

[endel]

Thank you @afrokick 🎉