refactor: remove capability module

[tac0turtle]

Description

removes capability module since it will ive in ibc-go for 0.48

cosmos/ibc-go#3097

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[chatton]

LGTM 👍

[julienrbrt]

lgtm! we should add section to the UPGRADING.md (### Modules section) and remove it from here: https://github.com/cosmos/cosmos-sdk/tree/main/x#readme

[julienrbrt]

As Marko mentioned, when IBC has a link about capability's readme (after cosmos/ibc-go#3097 is merged). We should redirect these links and /main/modules/capability to the readme (https://github.com/cosmos/ibc-go/blob/marko/capability/capability/README.md but pointing to the main branch then)