Make GroupInfo public and fix docs

[mulmarta]

GroupInfo is in one variant of the public ReceivedMessage enum, so should be public. Also ClientConfig in UniFFI should be public, I think.

Also fixed all warnings generated by cago doc --all-features.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (d54563f) to head (400e2d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #132   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files         173      173           
  Lines       31450    31450           
=======================================
  Hits        28151    28151           
  Misses       3299     3299           

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