feat: Rework fig autocomplete command

[dirien]

Signed-off-by: Engin Diri engin.diri@mail.schwarz

Summary

This PR creates the first part of the steps described here #2186

Adding @developer-guy, as he created the first iteration of the fig integration.

Release Note

NONE

Documentation

NONE

[codecov-commenter]

Codecov Report

Merging #2187 (6c4f607) into main (8f29f03) will increase coverage by 0.65%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2187      +/-   ##
==========================================
+ Coverage   26.03%   26.69%   +0.65%     
==========================================
  Files         131      131              
  Lines        7689     7690       +1     
==========================================
+ Hits         2002     2053      +51     
+ Misses       5445     5376      -69     
- Partials      242      261      +19     

Impacted Files	Coverage Δ
cmd/cosign/cli/commands.go	0.00% <0.00%> (ø)
pkg/blob/load.go	74.28% <0.00%> (+5.71%)	⬆️
pkg/oci/layout/index.go	28.57% <0.00%> (+28.57%)	⬆️
pkg/oci/layout/write.go	37.50% <0.00%> (+37.50%)	⬆️
pkg/oci/layout/signatures.go	53.84% <0.00%> (+53.84%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[cpanato]

Thanks
Lgtm