Migrate CosmWasm workspace

[seanchen1991]

Closes: #1311

Description

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PR author checklist:

• [ ] Added changelog entry, using unclog.
• [ ] Added tests.
• [ ] 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).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.99%. Comparing base (b7dbc41) to head (b76561e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1315 +/- ## ======================================= Coverage 66.99% 66.99% ======================================= Files 227 227 Lines 23448 23448 ======================================= Hits 15709 15709 Misses 7739 7739 ```

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[seanchen1991]

Closing this PR as we didn't move the cosmwasm directory out in such a way that preserved its git history.

[seanchen1991]

On second thought, the commits in this PR should be fine to merge, as migrating the files out of ibc-rs should not have any adverse effects on its git history.