[Feature] Add timeout option

[LukeSavefrogs]

It would be very useful to have an option called timeout (maybe by default set to 0 to allow retrocompatibility) that would cause the watcher to throw an Exception if the execution time exceeded N ms.

For now i implemented like this (the Promise part with resolve and reject can be omitted; i added it only for the sake of completeness):

return new Promise((resolve, reject) => {
    // Watch event on download folder or file
    const watcher = chokidar.watch(target, {
        interval: 500,
        awaitWriteFinish: true,
    });
    
    // Stop watching the file if the timeout is reached
    let watcherTimeout = setTimeout(async () => {
        console.log("Timeout reached!");
        if (watcher && Object.keys(watcher.getWatched()).length !== 0) {
	        console.log("Closing watcher!");
	        await watcher.close();
	        reject(`Timeout reached while waiting for file '${target}' to be created!`);
        }
    }, 5000);
    
    // Start watching until the file has been created with the expected FileName (temporary has '.crdownload' extension)
    watcher
      .on('ready', () => console.log('Initial scan complete. Ready for changes'))
      .on('add', (path, stats) => {
	      console.log(`File '${path}' has been added (${stats?.size} bytes)`);
	      watcher.unwatch(target).close().then(() => {
		      clearTimeout(watcherTimeout);
		      resolve(target);
	      });
      });
});