fix: add missing mempool cleanup rules

[glevco]

Motivation

This PR adds missing mempool cleanup rules that must be in place because they're related to feature activations.

Acceptance Criteria

• Add fee header and fee token version to the nano activation rule.
• Add checkdatasig count activation rule.

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

❌ Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.11%. Comparing base (dce22bf) to head (aa3ff28).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/consensus/consensus.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1464      +/-   ##
==========================================
+ Coverage   86.01%   86.11%   +0.09%     
==========================================
  Files         435      435              
  Lines       33919    33940      +21     
  Branches     5297     5302       +5     
==========================================
+ Hits        29176    29227      +51     
+ Misses       3697     3675      -22     
+ Partials     1046     1038       -8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.