test: add Noble/Penumbra IBC smoke test script

[zbuc]

Describe your changes

This adds a test script that performs bidirectional IBC transfers between Penumbra and Noble.

Prerequisites:

• A Noble account with uusdc funds
• A Penumbra account with UM funds to pay fees
• A checkout of the Noble SDK
• A working pcli installation in the $PATH
• jq

This should be integrated into a GitHub workflow. It's not clear if it belongs in the existing smoketest workflow or a new workflow.

Checklist before requesting a review

• I have added guiding text to explain how a reviewer should test these changes.

• If this code contains consensus-breaking changes, I have added the "consensus-breaking" label. Otherwise, I declare my belief that there are not consensus-breaking changes, for the following reason:

  test only

[conorsch]

Rebased this and ran shellcheck on it. While we're not using the script in CI, it will likely prove useful when evaluating fixes related to #4899, so I'm pulling it into tree.