Duplex IBC for Accounts

[Kayanski]

This PR aims at allowing duplex communication for abstract IBC accounts (remote can also call the local account).

Current Status

When the IBC host receives an IBC message, it appends the sending chain name to the account trace before proceeding with executing the sent action.

Major changes

When the IBC host receives an IBC message, it modifies the account trace in the following way before proceeding with executing the sent action :

• If the account_id is remote and the last trace matches the current chain, we pop the chain name
• Otherwise, we just add the sending chain to the trace

Outstanding problem

The IBC host needs to be a manager of the resulting abstract account to be able to execute messaes on their behalf.
--> The IBC host should be an admin of the manager of all abstract accounts that have IBC enabled.

Checklist

• CI is green.
• Changelog updated.

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View logs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 86.9%. Comparing base (fc805d6) to head (6f9fc63).

Additional details and impacted files

Files	Coverage Δ
.../contracts/native/ibc-host/src/endpoints/packet.rs	85.5% <50.0%> (-8.8%)	⬇️

... and 1 file with indirect coverage changes

[CyberHoward]

Closing because of outstanding problem. Duplex module <> module IBC should account for all practical usecases.