* min gas denominator implementation
* update changelog
* modify MinGasDenominator type to sdk.Dec
* fix typo in comments
* add comments
* update comment
* refactor logic
* remove unnecesary test
* fix typo on proto
* rename param
* fix tests
* use truncate and run mod tidy
* comment to default value
* update changelog
* rename temporary gas used
* integration tests
* add migrations
* add default as var
Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
