feat: use custom proposal handler to prevent iterating whole mempool

[beer-1]

skip lanes are iterating whole lane txs event max gas or max bytes are reached, so to prevent that case we make custom proposal handler.

[codecov]

Codecov Report

Merging #36 (02681b6) into main (571b047) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 72.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   44.65%   44.65%           
=======================================
  Files         164      164           
  Lines       16142    16142           
=======================================
  Hits         7208     7208           
  Misses       8155     8155           
  Partials      779      779           

Files	Coverage Δ
app/app.go	88.44% <100.00%> (ø)
x/move/types/connector.go	25.06% <0.00%> (ø)