External memory leak

[twoeths]

Description
In lodestar if it sets "udp" port in enr, then external memory keeps increasing

It's likely this issue links to the NODES handlers

This happens with discv5 0.7.1 (could be with the latest version too)

[twoeths]

I've had several tests at discv5:

• udp send/receive tests
• encode nodes response test
• async/await send api tests
• different improvements in handleFindNode

none of them work (either cannot reproduce the issue with the discv5 test only, or the issue still happens if I try with lodestar)

discv5 may not be the root cause, the issue may happen because a side effect of setting enr to udp that cause lodestar receives so may peers and it switches peers a lot, see ChainSafe/lodestar#4623 (comment)

[twoeths]

closing the issue, root cause was ChainSafe/node-snappy-stream#16