Add mutli rev support for function describe

[karajan1001]

fix: #144

In our current describe function we only accept one rev at a time and will try to get a reference for every reference in the repo. It will cost O(MN) in the exp show in which we try to get a ref for every single experiment.

[codecov-commenter]

Codecov Report

Base: 82.25% // Head: 82.23% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (8b905d7) compared to base (ed17985).
Patch coverage: 96.15% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
- Coverage   82.25%   82.23%   -0.02%     
==========================================
  Files          25       25              
  Lines        3353     3367      +14     
  Branches      574      578       +4     
==========================================
+ Hits         2758     2769      +11     
- Misses        515      517       +2     
- Partials       80       81       +1     

Impacted Files	Coverage Δ
src/scmrepo/git/backend/base.py	80.59% <ø> (ø)
src/scmrepo/git/backend/gitpython.py	64.42% <ø> (ø)
src/scmrepo/git/backend/pygit2.py	79.38% <ø> (ø)
src/scmrepo/git/backend/dulwich/__init__.py	81.41% <87.50%> (-0.02%)	⬇️
src/scmrepo/git/__init__.py	84.05% <100.00%> (+0.54%)	⬆️
tests/test_git.py	100.00% <100.00%> (ø)
tests/conftest.py	93.00% <0.00%> (-2.00%)	⬇️

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[skshetry]

@karajan1001, can you please post the new results of the profiling with this patch in the same way that you did on #144?

Also before/after runtime for a real dvc exp show would be great.

[karajan1001]

@karajan1001, can you please post the new results of the profiling with this patch in the same way that you did on #144?

Also before/after runtime for a real dvc exp show would be great.

In iterative/dvc#8453. In the same repo, this version of describe runs 5 times faster than the previous one. (With the experiment) grows the difference will be even bigger.

[skshetry]

I don't think I have enough understanding about this on the exp side. So I'll leave this up to @pmrowla.

I will suggest considering RefsIterator or something similar concept that allows us to do this kind of thing, as it seems this way we may need to extend multiple APIs to support lists, breaking the API. Also repo.refs of dulwich comes to mind, but it's limited (but we can extend :) ).

Anyway, I'm okay with this for the time being. :)