Add cargo doc check to CI

[Farhad-Shabani]

Closes: #330

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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]

Codecov Report

Base: 62.96% // Head: 62.96% // No change to project coverage 👍

Coverage data is based on head (03d577b) compared to base (475ffa0).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #332   +/-   ##
=======================================
  Coverage   62.96%   62.96%           
=======================================
  Files         124      124           
  Lines       13931    13931           
=======================================
  Hits         8772     8772           
  Misses       5159     5159           

Impacted Files	Coverage Δ
crates/ibc/src/lib.rs	100.00% <ø> (ø)

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[plafer]

good catch!