Remove all remnants of the OCap systems

[hu55a1n1]

Summary

We currently have some vestigial OCap related code that is dysfunctional and should be removed from the ibc crate.

Problem Definition

Further to the excellent points raised by @plafer (https://github.com/informalsystems/ibc-rs/issues/2013#issuecomment-1090965987), and other related discussions (https://github.com/informalsystems/ibc-rs/issues/2013), I think we agree that it doesn't make sense to have an OCap facility in a system with untrusted modules and without strictly enforced memory isolation.
We currently use OCaps for two things - binding modules to ports and tracking channel/port ownership, so we need to figure out what exactly must be removed.

Note: this may be considered a divergence from the ICS spec.

Acceptance Criteria

Any unused OCap related code is removed from the ibc crate.

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