Error parsing ibc hooks memo object

[nullpointer0x00]

Description

Error was caused by trying to convert a json object from a string that contained a string value that was also a json. In this case, the memo field in an ibc packet contained json.

I added tests to confirm that a json that is formatted still passed worked.

closes: #501

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit and integration
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[SpicyLemon]

ktlint / ktlint (pull_request) is failing. No clue if that's expected or not, though.

[nullpointer0x00]

@SpicyLemon Thanks! Yeah, I keep forgetting to check that. Need to setup my workspace with intellij better to try to fix that for me. We have it nice with our go project...