feat(p2p): Add misbehavior score for unsolicited vertices

[msbrogli]

Motivation

This PR introduces a misbehavior score but simply close the connection when the threshold is reached. A future PR can enforce better responses to misbehavior (e.g., temporary ban for the peer id or ip address).

Acceptance Criteria

1. Reject unsolicited vertices.
2. Add _inbound_relay_enabled: bool to control whether we request relay from the peer.
3. Add a misbehavior score for each connection which decays to zero in 1h.
4. If a peer misbehaves above a threshold, its connection is closed.

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

[codecov]

Codecov Report

Attention: Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.90%. Comparing base (b6a3221) to head (d0043ba).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/p2p/protocol.py	60.00%	3 Missing and 1 partial ⚠️
hathor/p2p/sync_v2/agent.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1296      +/-   ##
==========================================
+ Coverage   82.86%   82.90%   +0.03%     
==========================================
  Files         362      362              
  Lines       25823    25838      +15     
  Branches     3954     3956       +2     
==========================================
+ Hits        21399    21420      +21     
+ Misses       3697     3691       -6     
  Partials      727      727              

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