make ListInfo and variants public.

[sakosha]

What do these changes do?

Include BasicListInfo, ListInfo and UnixListInfo to aioftp.client.__all__.

Reasoning

PyCharm & VSCode intellisense add squiggle lines on imports like from aioftp.client import UnixListInfo.

Are there changes in behavior for the user?

Evil usages such as enumerating on __all__ and asserting length will break.

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.94%. Comparing base (253546a) to head (cf5dbf8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   97.94%   97.94%           
=======================================
  Files           6        6           
  Lines        2093     2093           
=======================================
  Hits         2050     2050           
  Misses         43       43           

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