Add Union IBC changes to Aptos IBC

[aeryz]

Phase 1: Modifications

• Change IBC client ids to be u32.
• Make IBC commitment paths byte prefixed and ethabi encoded. example
• Change commitments to be keccak256(ethabi.encode(elem)). example
• Check out whether there is a change in any of the committed struct. I remember packet is changed for example. And change the types accordingly.
  • ConnectionEnd commitment
  • Channel commitment
  • Packet commitment
• Make sure the event types are being changed accordingly.
• Change channel-id and connection-id to be u32.

Phase 2: Adding new features

• Intent-based bridging:
  • recvIntentPacket
• Batch packets:
  • batchAcks
  • batchSend
  • We also do batch related operations in the regular IBC functions. So make sure to check those out.