`annotate`: Introduce `requirements`.

[daavoo]

Quick and dirty draft. Being discussed in https://github.com/iterative/studio/issues/4118

[codecov-commenter]

Codecov Report

Merging #225 (00402c9) into main (24e4996) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   83.76%   83.88%   +0.11%     
==========================================
  Files          16       16              
  Lines        1540     1551      +11     
==========================================
+ Hits         1290     1301      +11     
  Misses        250      250              

Impacted Files	Coverage Δ
gto/api.py	80.00% <ø> (ø)
gto/cli.py	69.53% <ø> (ø)
gto/config.py	95.95% <100.00%> (+0.21%)	:arrow_up:
gto/index.py	91.32% <100.00%> (+0.20%)	:arrow_up:

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