Mint coins restrictions from app.go

[ValarDragon]

Summary

Our github project tracking for cosmos#10771

We need this in next release, if SDK folks have a different vision, we will have to go ahead and merge this for use in our next release, and switchover whenever that new vision lands. (I doubt it'd land in next 3 months, and we want this as a defense in depth relatively soon, and its a blocker for superfluid)

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