feat: Move get_cose_sign1 into c2pa-crypto crate

[scouten-adobe]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.36170% with 10 lines in your changes missing coverage. Please review.

Project coverage is 80.68%. Comparing base (eea9068) to head (6a09204).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sdk/src/cose_validator.rs	85.07%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #794      +/-   ##
==========================================
+ Coverage   80.66%   80.68%   +0.01%     
==========================================
  Files         116      117       +1     
  Lines       31042    31046       +4     
==========================================
+ Hits        25041    25048       +7     
+ Misses       6001     5998       -3     

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