Async methods for requesting packets

[mkapal]

As suggested in #51 (comment)

Problem

There are cases when a request packet is sent and then a response is received in another packet. When doing that, you must keep several things in mind:

• keep the ReqI of the request packet in sync with the check in the reply packet event listener
• make sure the ReqI is unique so the listener will only handle the correct request and not a different one

Example:

const REQUEST_ID = 255;

this.send(
  new IS_TINY({
    ReqI: REQUEST_ID,
    SubT: TinyType.TINY_GTH,
  }),
);

this.once(PacketType.ISP_SMALL, (packet) => {
  if (packet.ReqI === REQUEST_ID && packet.SubT === SmallType.SMALL_RTP) {
    // Do something with packet.UVal
  }
});

Solution

Create new public async methods in the InSim class.

Example usage:

const sessionTime = await inSim.getCurrentSessionTime();

Requirements

The ReqI must be unique in such a way that if multiple requests are sent at the same time, they both get resolved independently.

Requests

Name	Request packet	Reply packet
Ping	IS_TINY SubT: TinyType.TINY_PING	IS_TINY SubT: TinyType.TINY_REPLY
Get current session time	IS_TINY SubT: TinyType.TINY_GTH	IS_SMALL SubT: SmallType.SMALL_RTP
TODO