Add --simple flag to gto register

[aguschin]

close #233

[codecov-commenter]

Codecov Report

Base: 80.91% // Head: 80.64% // Decreases project coverage by -0.26% ⚠️

Coverage data is based on head (6194c34) compared to base (691ca4b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   80.91%   80.64%   -0.27%     
==========================================
  Files          16       16              
  Lines        1886     1886              
==========================================
- Hits         1526     1521       -5     
- Misses        360      365       +5     

Impacted Files	Coverage Δ
gto/config.py	95.78% <ø> (ø)
gto/cli.py	69.56% <100.00%> (ø)
gto/_version.py	36.36% <0.00%> (-45.46%)	⬇️

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