Find alternative for Bookkeeper queue and queued

[KasperZutterman]

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

Lines 5 to 9 in cc27b5e

	protected readonly queue = new PriorityQueue({ comparator: compareFragments});
	protected readonly queued: any = new LRU({
	max: 500,
	maxAge: 1000 * 60 * 60 * 24
	}); // to know whether a fragment URL is already added to the priority queue

Possibly replaceable by https://www.collectionsjs.com/sorted-map