* add new unit test to validate that any peer can be retrieved
* add new discv5 test and better peer store management
* wakuPeerStore -> switch.peerStore
* simplify waku_peer_store, better logs and peer_manager enhancements
This reverts commit dc1d6ce4bf7390e23b73d96634ff87ca9341e129.
We need to revert this commit because
the waku-simulator stopped working. i.e. the nodes couldn't establish
connections among them: 054ba9e33f
Also, the following js-waku test fails due to this commit:
"same cluster, different shard: nodes connect"
* waku_lightpush/protocol.nim: minor changes to make it compile after revert