feat(cawg_identity): Add BuiltInSignatureVerifier

[scouten-adobe]

No description provided.

[scouten-adobe]

This is a draft – more to do, which I'm hoping to do tomorrow morning

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.00%. Comparing base (b86eb34) to head (d747c45).

❗ There is a different number of reports uploaded between BASE (b86eb34) and HEAD (d747c45). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (b86eb34)	HEAD (d747c45)
	9	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #978       +/-   ##
===========================================
- Coverage   78.84%   26.00%   -52.85%     
===========================================
  Files         146      125       -21     
  Lines       35243    25723     -9520     
===========================================
- Hits        27787     6689    -21098     
- Misses       7456    19034    +11578     

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[gpeacock]

This looks fine to me. I found it pretty impossible to do this with a dynamic trait, but it works as an enum. If you want to merge this in, I could integrate it with my PR. I'd just like to get that PR landed if possible.