Enable support for IBC to only use proto

[colin-axner]

Summary

Simulations break if IBC enables a non-empty genesis. IBC 1.0 will not support amino nor have any reference to amino.

Problem Definition

Following the merge of #6974 localhost will not be created during simulations to allow for an empty genesis and avoid encoding panics during init genesis. I added a comment to why I think this is on the ibc-genesis migration pr.

My knowledge is a bit limited in this encoding area so I may have made incorrect deductions, but with the current implementation in IBC, simulations will not pass given a non-empty genesis. We added a unit test to replicate the functionality of import-export using a proto codec and this test passes (when given both empty and non-empty genesis), which leads me to assume this is entirely an amino issue.

Proposal

simapp should use proto, it can still support amino for legacy querier options, but we should be running genesis import export simulations with a proto codec.

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