feat(mempool): Optimize mempool cleaning

[msbrogli]

Motivation

The changes in ./hathor in this PR have already been released in #1524 in the following commit: d929a7c

Acceptance Criteria

• Include here all things that this PR should solve

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

[github-actions]

Bencher Report

Branch	feat/optimize-mempool-cleaning
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.68 m (-2.92%) Baseline: 1.73 m	1.55 m (92.71%)	2.07 m (80.90%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.27%. Comparing base (e6f4d00) to head (cafc16b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1526      +/-   ##
==========================================
+ Coverage   86.25%   86.27%   +0.02%     
==========================================
  Files         438      438              
  Lines       33736    33736              
  Branches     5267     5267              
==========================================
+ Hits        29100    29107       +7     
+ Misses       3622     3617       -5     
+ Partials     1014     1012       -2     

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