Rename leftover modules crate to ibc-relayer-types and trim it down

[romac]

Summary

Rename leftover modules crate to ibc-relayer-types and clean it up to remove everything not needed by the relayer, eg. the handlers.

Problem Definition

Now that the ibc and ibc-proto crates have been split out into their own repositories, we are left with a copy of the ibc crate in the crates/modules folder.

Proposal

• Rename the ibc crate in the crates/modules folder to ibc-relayer-types
• Rename crates/modules to crates/relayer-types
• Update the workspace Cargo.toml and the [dependencies] section of all crates which depend on ibc
• Update all the import paths in all the crates which now depend on ibc-relayer-types
• Remove all the handlers from ibc-relayer-types and all the code which depend on it
  • Handlers themselves
  • Contexts, readers and keepers
  • Mock contexts, mock chain, etc.
  • MBT tests, tests against the mock chain
• Remove references to the mock chain and mock client from the ibc-relayer crate

Follow-up:

• Undo the changes introduced in #2332 #2412 and #2483 #2715

Acceptance Criteria

All steps above have been carried out.

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For Admin Use

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