feat(side-dag): implement Proof-of-Authority

[glevco]

Motivation

Implement Proof-of-Authority block, verification, and related configuration.

Acceptance Criteria

• Add new VertexVerifier.verify_version().
• Add CONSENSUS_ALGORITHM settings. When PROOF_OF_AUTHORITY is set:
  • Disable mining WebSocket.
  • Enable PoaBlock and disable Block and MergeMinedBlock.
  • Disable TransactionVerifier.verify_weight().
• Implement get_hashed_poa_data() and sign_poa().
• Implement PoaBlockVerifier.verify_poa().

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 85.71429% with 36 lines in your changes missing coverage. Please review.

Project coverage is 84.91%. Comparing base (c075d5e) to head (701491c).

Files	Patch %	Lines
hathor/verification/verification_service.py	50.00%	10 Missing and 5 partials ⚠️
hathor/transaction/poa/poa_block.py	72.41%	4 Missing and 4 partials ⚠️
hathor/consensus/poa/poa_signer.py	92.45%	2 Missing and 2 partials ⚠️
hathor/transaction/base_transaction.py	60.00%	1 Missing and 1 partial ⚠️
hathor/verification/poa_block_verifier.py	95.23%	2 Missing ⚠️
hathor/verification/vertex_verifier.py	50.00%	1 Missing and 1 partial ⚠️
hathor/builder/resources_builder.py	66.66%	0 Missing and 1 partial ⚠️
hathor/conf/get_settings.py	80.00%	1 Missing ⚠️
hathor/consensus/consensus_settings.py	97.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1060      +/-   ##
==========================================
+ Coverage   84.82%   84.91%   +0.08%     
==========================================
  Files         300      307       +7     
  Lines       22936    23173     +237     
  Branches     3471     3503      +32     
==========================================
+ Hits        19456    19677     +221     
- Misses       2787     2793       +6     
- Partials      693      703      +10     

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