Allow parallel fetching

[KasperZutterman]

Enable the EventStream to run fetchNextPage() in parallel for faster execution.
Keep in mind that exporting should not be broken.

event-stream-client/packages/actor-init-ldes-client/lib/EventStream.ts

Lines 177 to 197 in c9b4957

	public async _read() {
	try {
	if (!this.downloading && this.paused) {
	super.pause();
	}
	else if (!this.downloading && !this.isPaused() && this.bookkeeper.nextFragmentExists()) {
	if (!this.disableSynchronization && this.bookkeeper.inSyncingMode() && !this.syncingmode) {
	this.syncingmode = true;
	this.emit('now only syncing');
	}
	await this.fetchNextPage();
	}
	else if (!this.downloading) {
	//end of the stream
	this.log('info', "done");
	this.push(null);
	}
	} catch (e) {
	console.error(e);
	}
	}