Allow passing ref to api._show_versions

[aguschin]

Bare minimum needed for iterative/mlem#665

Tasks

Beta Give feedback

1. Allow passing refs, getting right version
2. Add tests

Overall, feels like GTO codebase needs a refactoring... While working on this I started with #361, and it's tough to add anything like that without rewriting big chunks of GTO now. There are many things each stepping on other's toes... Plus many implementation decisions were made taking annotations into account, which is no longer a thing in GTO, except for some API for Studio to enable backward compatibility while making updates easier. They should be thrown away to make it easier to contribute new features 🪣

[codecov-commenter]

Codecov Report

Patch coverage: 94.73% and project coverage change: +0.21 🎉

Comparison is base (27c2355) 85.15% compared to head (6b90b35) 85.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
+ Coverage   85.15%   85.37%   +0.21%     
==========================================
  Files          18       18              
  Lines        2115     2126      +11     
==========================================
+ Hits         1801     1815      +14     
+ Misses        314      311       -3     

Impacted Files	Coverage Δ
gto/api.py	89.51% <94.73%> (+0.11%)	⬆️

... and 1 file with indirect coverage changes

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