Include support for ICS20-v2

[srdtrk]

Summary

Support the latest version of the transfer application

Problem Definition

Support the latest ICS20 specs. This issue needs discussion until the following are resolved:

• What are the new gas costs?
• How would solvers work with multi-denom packets?
• Will we have transfer+action workflow supported?

Use cases

• Multi denom transfers
• Multi hop transfers

Proposal

In our initial implementation we don't need to include support for multihop transfers where EVM is a middle-chain for simplicity.

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For Admin Use

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[womensrights]

As we discussed internally:

• if we support two versions of ics-20 at launch, this will add additional complexity
• there are benefits to ics-20v2 related to the denom trace
• we will need a forwarding solution for eureka

Therefore, we should use ics20v2 over ics20 v1