refactor(consensus): Split on_new_vertex() and remove fails_silently

[msbrogli]

Motivation

This PR prepares for enforcing different rules depending on how the vertex was received.

Acceptance Criteria

1. Add VertexHandler.on_new_block() which adds a new block and its dependencies.
2. Add VertexHandler.on_new_mempool_transaction() which adds a new transaction in the mempool.
3. Add VertexHandler.on_new_relayed_vertex() which adds an unsolicited vertex.
4. Remove VertexHandler.on_new_vertex() and the choice to fail silently.
5. Remove fails_silently argument from HathorManager.on_new_tx().
6. No new rule is actually enforced here.

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 87.67123% with 9 lines in your changes missing coverage. Please review.

Project coverage is 82.86%. Comparing base (b7abaae) to head (b6a3221).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/vertex_handler/vertex_handler.py	79.31%	4 Missing and 2 partials ⚠️
hathor/p2p/sync_v2/agent.py	78.57%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1295      +/-   ##
==========================================
+ Coverage   82.81%   82.86%   +0.05%     
==========================================
  Files         362      362              
  Lines       25819    25823       +4     
  Branches     3952     3954       +2     
==========================================
+ Hits        21382    21399      +17     
+ Misses       3706     3697       -9     
+ Partials      731      727       -4     

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