imp: implement From<Infallible> for ClientError

[Farhad-Shabani]

Closes: #1356

Relevant PR in the cosmwasm-ibc repository: informalsystems/cosmwasm-ibc#3

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PR author checklist:

• Added changelog entry, using unclog.
• Linked to GitHub issue.
• 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]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 66.84%. Comparing base (e50ae6c) to head (33d9b86).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ibc-core/ics24-host/types/src/error.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1359      +/-   ##
==========================================
- Coverage   66.85%   66.84%   -0.01%     
==========================================
  Files         225      225              
  Lines       22628    22631       +3     
==========================================
  Hits        15127    15127              
- Misses       7501     7504       +3     

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[rnbguy]

LGTM 👍 but do we need a changelog for this ?