Migrate PutLogLevel to MigratingEndpointAdapter

[courtneyeh]

fixes #5797

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

[rolfyone]

LGTM, just make sure we can post to update log level and it sticks...

should be pretty easy hopefully, send it something like:

{
  "level": "TRACE",
  "log_filter": [
    "tech.pegasys.teku.networking.p2p.libp2p.gossip.GossipHandler"
  ]
}

and you should see a bunch of trace in the logs (connect to mainnet with initial-state)