feat: prevent executing original function multiple times

[yofukashino]

Changes the instead patch logic to accept a function as return value from callback.
So that it can race condition functions like send message get executed only once after 2 seconds of sleep;

All Async patches are ran at the same time asynronously so it can cause issues but this is the best way if not introducing seperate async injector functions

Code Example:

  import { Injector, common, webpack, util } from "replugged";
 
  const injector = new Injector();
 
  export async function start() {
    injector.instead(common.messages, "sendMessage", async (_, origFunc) => {
      await Promise.resolve();
      return origFunc;
    });
    
     injector.instead(common.messages, "sendMessage", async (_, origFunc) => {
      await util.sleep(2000);
      return origFunc;
    });
  }
 
  export function stop() {
    injector.uninjectAll();
  }

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