Add PoA module support

[fmorency]

title

[Reecepbcups]

ref: cleanup and prettify https://github.com/strangelove-ventures/poa/blob/main/e2e/helpers/poa.go (use gRPC for queries instead). See about any upstream repos using and grab helpers too, if any

cosmos/module_poa.go

also import it as a dep and default register interfaces. No downside since we depend on staking within POA anyways

[Reecepbcups]

For ICT, I am against adding support and adding in more upstream blockers for SDK upgrades.

The better approach here is to have the ICT helpers done in the POA module properly. This way you just import poa in your e2e/interchaintest directory and use it there.

This goes along with the refactor I want to build out in ICT to make extending it easier

Groups is still on the table since it is a core part of the SDK, just not a priority for us atm