module: consensus-param module

[tac0turtle]

Summary

With the deprecation of the param module, there is a need to allow governance or another account to modify these parameters. In a few discussions with the sdk team we opted to create a consensus param module to house these parameters.

Theses parameters will need to be made available to base app so that the parameters can be sent back to tendermint when they are modified. We do something similar with the upgrade module and the version setter.

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[alexanderbez]

@marbar3778 let's be sure to reference this/add it to the EPIC.