fix(reward-lock): save removed txs in the consensus context

[glevco]

Depends on #1091

Motivation

When transactions get removed from the mempool after a reorg makes them invalid, their dependencies' metadata is updated. This update was being done directly in the storage, instead of in the consensus' context. This PR fixes this.

Acceptance Criteria

• Move remove_transactions() from the TransactionStorage to the Consensus, as it is only used there and shouldn't be used anywhere else.
  • It should be the same, except now it receives a context argument and saves metadata through it instead of directly in the storage.
• Update event simulator tests accordingly, as now 3 extra events are generated (that were missing before).

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 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.00%. Comparing base (e61463e) to head (640b99d).

Files	Patch %	Lines
hathor/consensus/consensus.py	96.87%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1092      +/-   ##
==========================================
- Coverage   85.08%   85.00%   -0.08%     
==========================================
  Files         314      314              
  Lines       23919    23922       +3     
  Branches     3614     3614              
==========================================
- Hits        20351    20335      -16     
- Misses       2863     2876      +13     
- Partials      705      711       +6     

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The base branch was changed.

The merge-base changed after approval.