Cosmos Gas Multiplier Params

[Kbhat1]

Describe your changes and provide context

• Create cosmos gas multiplier params
• Add back eventManager to cachekv

Testing performed to validate your change

• Validated on chain

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.87970% with 64 lines in your changes are missing coverage. Please review.

Project coverage is 55.51%. Comparing base (4e37eb4) to head (f835590).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
+ Coverage   55.46%   55.51%   +0.04%     
==========================================
  Files         629      631       +2     
  Lines       53549    53669     +120     
==========================================
+ Hits        29703    29793      +90     
- Misses      21734    21759      +25     
- Partials     2112     2117       +5     

Files	Coverage Δ
store/cachekv/mergeiterator.go	79.87% <100.00%> (+0.65%)	⬆️
x/params/keeper/genesis.go	100.00% <100.00%> (ø)
x/params/keeper/migrations.go	100.00% <100.00%> (ø)
store/types/gas.go	80.79% <86.66%> (+0.54%)	⬆️
store/cachekv/store.go	79.91% <50.00%> (-0.92%)	⬇️
x/params/module.go	57.69% <72.72%> (+2.37%)	⬆️
x/params/keeper/keeper.go	71.42% <64.70%> (+22.49%)	⬆️
x/params/types/params.go	26.08% <52.17%> (+26.08%)	⬆️
x/params/types/genesis.go	0.00% <0.00%> (ø)
x/params/client/cli/query.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

[udpatil]

do we need to add anything for import / export genesis?