Remove dependency on tendermint-rpc in ibc crate

[romac]

Crate

abc

Summary

Remove dependency on tendermint-rpc in ibc crate by moving the get_all_events function into the relayer.

Problem Definition

The ibc crate should not imply a dependency on tendermint-rpc and all its transitive dependencies, especially since the function that introduces the dependency is only use in the ibc-relayer crate.

Proposal

• Move get_all_events into ibc-relayer.
• Make tendermint-rpc a test-only dependency.

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned