unpack ICS008 wasm client state at ConnOpenTry and ConnOpenAck

[rnbguy]

Closes: #1237

Description

---

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

Attention: Patch coverage is 71.42857% with 12 lines in your changes missing coverage. Please review.

Project coverage is 67.26%. Comparing base (c2c8dfa) to head (43b88a6).

Files	Patch %	Lines
ibc-core/ics03-connection/src/handler/mod.rs	50.00%	12 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1246 +/- ## ======================================= Coverage 67.25% 67.26% ======================================= Files 234 235 +1 Lines 23478 23516 +38 ======================================= + Hits 15791 15817 +26 - Misses 7687 7699 +12 ```

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