RPC: fix recursiveNodeLookup

[ScottyPoi]

Bug unconvered through use of glados-cartographer

portal_*RecursiveFindContent was not returning the expected array of ENRs.

Changes:

1. NodeLookup now takes an optional refresh parameter

• if true, NodeLookup will exit early when the target bucket is full
• set to true in bucketRefresh

2. NodeLookup now tracks all found ENRs in a Heap called this.foundNodes

• Heap is automatically sorted by distance to target

3. NodeLookup.startLookup() now returns the closest 16 ENRs from foundNodes heap

• As ENR string array (sorted)

4. RPC methods portal_*RecursiveFindNodes now returns ENR list from NodeLookup.startLookup()

This PR also implements the same method for state and beacon networks, which were previously without this method.

[ScottyPoi]

I didn't realize that this method was used by Glados. We otherwise only use the NodeLookup class during bucketRefresh, and recent updates to NodeLookup were optimized for this purpose. These optimizations may not be ideal for the glados-cartographer use of NodeLookup, which may be interested in tallying ENRs that exist in the network outside of the local routing table.

[acolytec3]

I also added some fixes for the *traceGetContent work in the contentLookup folder related to glados-audit