feat(core-p2p): milestone hash

[spkjp]

Proposed changes

Reject peers with a different milestone hash.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build (changes that affect the build system)
• Docs (documentation only changes)
• Test (adding missing tests or fixing existing tests)
• Other... Please describe:

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov-io]

Codecov Report

Merging #1837 into develop will decrease coverage by 0.03%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #1837      +/-   ##
===========================================
- Coverage    39.76%   39.73%   -0.04%     
===========================================
  Files          354      354              
  Lines         7682     7689       +7     
  Branches      1121     1114       -7     
===========================================
  Hits          3055     3055              
- Misses        4612     4620       +8     
+ Partials        15       14       -1

Impacted Files	Coverage Δ
packages/core-p2p/src/court/offences.ts	100% <ø> (ø)	⬆️
packages/core-p2p/src/court/guard.ts	0% <0%> (ø)	⬆️
packages/core-p2p/src/peer.ts	0% <0%> (ø)	⬆️
packages/core-blockchain/src/state-machine.ts	42.92% <0%> (ø)	⬆️
...ackages/core-p2p/src/server/plugins/set-headers.ts	0% <0%> (ø)	⬆️
packages/core-p2p/src/monitor.ts	0% <0%> (ø)	⬆️
packages/core-test-utils/src/generators/wallets.ts	85.71% <0%> (ø)	⬆️

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