fix: distribution iterator to do single iter

[beer-1]

replace multiple level iterations to single iteration

[codecov]

Codecov Report

Attention: 1736 lines in your changes are missing coverage. Please review.

Comparison is base (48f6c57) 39.18% compared to head (30300a5) 39.18%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   39.18%   39.18%   -0.01%     
==========================================
  Files         162      162              
  Lines       16694    16689       -5     
==========================================
- Hits         6542     6540       -2     
+ Misses       9067     9066       -1     
+ Partials     1085     1083       -2     

Files	Coverage Δ
app/genesis.go	43.43% <100.00%> (ø)
x/distribution/autocli.go	100.00% <100.00%> (ø)
x/distribution/types/codec.go	0.00% <ø> (ø)
x/distribution/types/params.go	66.66% <100.00%> (ø)
x/genutil/genesis.go	40.00% <ø> (ø)
x/gov/types/codec.go	0.00% <ø> (ø)
x/gov/types/genesis.go	73.07% <100.00%> (ø)
x/ibc/nft-transfer/keeper/genesis.go	17.24% <ø> (ø)
x/ibc/nft-transfer/keeper/grpc_query.go	2.56% <ø> (ø)
x/ibc/nft-transfer/keeper/keeper.go	64.40% <ø> (ø)
... and 106 more