feat(p2p): relay all recently-seen peers for neighbors

[msbrogli]

Motivation

The full node currently relays only connections in the ready state. So, if a connection drops for just a few seconds, we might not relay this peer information to our neighbors.

The current behavior of the full node involves requesting peer information from a neighboring node exclusively during the initial connection establishment phase. Consequently, if the full node attempts to establish a connection with a peer and that peer rejects the connection, there is a risk that the full node will subsequently remove this peer from its peer storage. As a result, there would be no further attempts made to connect to this particular peer in the future.

Acceptance Criteria

1. Clean up aged peers in ConnectionsManager.peer_storage.
2. Add PeerId.last_seen: float.
3. Update protocol.peer.last_seen when the connection is ready and when new messages are received.
4. Add known_peers.last_seen to /v1a/status API.
5. Remove time.time() from hathor.p2p.resources.StatusResource.
6. Add a looping call to call send_get_peers() every 5 minutes.
7. Relay only peer information that contains at least one entrypoint.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

The base branch was changed.

[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (fd3c1ff) 84.66% compared to head (2e4a962) 84.69%.
Report is 5 commits behind head on master.

❗ Current head 2e4a962 differs from pull request most recent head e305645. Consider uploading reports for the commit e305645 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #782      +/-   ##
==========================================
+ Coverage   84.66%   84.69%   +0.03%     
==========================================
  Files         264      266       +2     
  Lines       22034    22117      +83     
  Branches     3369     3378       +9     
==========================================
+ Hits        18654    18731      +77     
- Misses       2725     2728       +3     
- Partials      655      658       +3     

Files	Coverage Δ
hathor/builder/cli_builder.py	74.48% <100.00%> (ø)
hathor/conf/mainnet.py	100.00% <ø> (ø)
hathor/conf/settings.py	97.29% <100.00%> (+0.11%)	⬆️
hathor/conf/testnet.py	100.00% <ø> (ø)
hathor/indexes/base_index.py	100.00% <100.00%> (ø)
hathor/indexes/height_index.py	96.61% <100.00%> (ø)
hathor/indexes/memory_height_index.py	83.33% <100.00%> (ø)
hathor/indexes/memory_info_index.py	91.66% <100.00%> (ø)
hathor/indexes/rocksdb_height_index.py	94.17% <100.00%> (+0.05%)	⬆️
hathor/p2p/peer_id.py	97.18% <100.00%> (-0.92%)	⬇️
... and 18 more

... and 4 files with indirect coverage changes

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