Clean code

[DaviRain-Su]

Closes: #XXX

Description

Since the IBC module has been spun off and the ibc-relayer-type crate is only used in Hermes and nowhere else, we can remove all no-std related content and default-features = false.

---

PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[romac]

Thank you for this! Can you please just undo the modifications to the dependencies? Removing the default features on all these crates adds a lot of dependencies which we don't actually need.

Otherwise it looks great!