Revert "fix: replace noop mempool with sender nonce mp"

[emidev98]

Reverts #283

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.45%. Comparing base (bf1c53b) to head (1190dd8).
Report is 1 commits behind head on release/v2.10.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/v2.10     #288      +/-   ##
=================================================
- Coverage          70.48%   70.45%   -0.03%     
=================================================
  Files                 45       45              
  Lines               2097     2095       -2     
=================================================
- Hits                1478     1476       -2     
  Misses               452      452              
  Partials             167      167              

Files	Coverage Δ
app/app.go	74.55% <ø> (-0.30%)	⬇️