Add public declarations using eval

[lgoettgens]

Resolves the Tar.jl part of JuliaLang/julia#51335 as suggested in #173 (comment).

Alternative to and thus closes #174.

This might have semantical conflicts with #173, so please re-run CI after merge of #173.

cc @LilithHafner @stevengj

[LilithHafner]

LGTM, provided someone familiar with the Tar API confirms that all documented behavior of create, extract, list, rewrite, tree_hash, and Header is part of the public API.

[stevengj]

Those are the 6 things that are currently documented in the Tar.jl manual, so I think it's safe to say that they are public APIs.

[lgoettgens]

I just updated this to contain the merge commit of #173 to make sure to not accidentally break something.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (166deb3) 97.53% compared to head (2a96754) 97.53%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #175   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files           4        4           
  Lines         810      810           
=======================================
  Hits          790      790           
  Misses         20       20           

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[LilithHafner]

@stevengj, I think this is ready to merge.