fix(attestations): add Solidity compatibility for signature and ABI encoding

[mariuszzak]

Description

• Add signature normalization to convert ECDSA recovery ID (v) from Ethereum format (27/28) to raw format (0/1) for go-ethereum compatibility (Inconsistent usage of V values in signatures ethereum/go-ethereum#19751)
• Change ABI encoding from flat params to tuple-wrapped struct format to match Solidity's abi.encode(PacketAttestation)
• Use raw commitment comparison instead of keccak256-hashed values to align with Solidity attestor light client

---

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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Include changelog entry when appropriate (e.g. chores should be omitted from changelog).
• Wrote unit and integration tests if relevant.
• Updated documentation (docs/) if anything is changed.
• Added godoc comments if relevant.
• Self-reviewed Files changed in the GitHub PR explorer.
• Provide a conventional commit message to follow the repository standards.

[codecov]

Codecov Report

❌ Patch coverage is 76.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.64%. Comparing base (421839a) to head (95b4331).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
modules/light-clients/attestations/signature.go	69.23%	4 Missing ⚠️
modules/light-clients/attestations/abi.go	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8723      +/-   ##
==========================================
+ Coverage   58.62%   58.64%   +0.02%     
==========================================
  Files         329      329              
  Lines       18465    18479      +14     
==========================================
+ Hits        10825    10837      +12     
- Misses       6990     6993       +3     
+ Partials      650      649       -1     

Flag	Coverage Δ
08-wasm	64.81% <ø> (ø)
e2e	0.95% <ø> (ø)
ibc-go	64.00% <76.66%> (+0.01%)	⬆️

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[srdtrk]

Lgtm