ICS20 v2 compatibility tracking

[ljoss17]

Background

ICS20 v2 will introduces multiples features which require changes on Hermes.
This issue will track all the changes needed in Hermes.

Tasks

• ICS20 Multidenom transfer: Add ICS20 v2 multiple denom compatibility #4006
• Packet data Protobuf encoding ICS20 v2 Protobuf encoding #4098

Futur tasks

• Relay asynchonous acknowledgements using the packet information emitted on the original packet send #4078
  • This has been postponed and will not be released in the initial version of ICS20 v2

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For Admin Use

• https://github.com/informalsystems/hermes/labels/tracking or https://github.com/informalsystems/hermes/labels/okr label (as well as any other appropriate labels) applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged