Add PayloadProvider interface to decouple AttestationToPayloadJSON from oci.Signature interface

[codysoyland]

I'm working on Policy Controller and need to use AttestationToPayloadJSON without having an entire oci.Signature. Since this func only needs the Payload, I added a small PayloadProvider interface containing only the Payload func, which preserves backwards compatibility while decoupling the oci.Signature interface.

Signed-off-by: Cody Soyland codysoyland@github.com

Summary

Release Note

Documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.60%. Comparing base (2ef6022) to head (ed091e8).
Report is 102 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3693      +/-   ##
==========================================
+ Coverage   40.10%   40.60%   +0.49%     
==========================================
  Files         155      157       +2     
  Lines       10044    10157     +113     
==========================================
+ Hits         4028     4124      +96     
- Misses       5530     5535       +5     
- Partials      486      498      +12     

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[haydentherapper]

Thanks!