Add interchain accounts module and migrations

[ryanchristo]

Summary

We will be updating ibc-go from v2 to v5 (#1327) in the next release and v3 adds support for interchain accounts. We need to decide on the parameters we want to set and add the necessary state migrations to support interchain accounts.

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[ryanchristo]

Following #1441 the controller module will be tracked in a separate issue #1453.