feat(cawg_identity): Add IdentityAssertion::to_summary and IdentityAssertion::summarize_all

[scouten-adobe]

Intended for use in various tools that require a JSON description of an identity assertion, including its validated/decoded content.

[codecov]

Codecov Report

Attention: Patch coverage is 78.35052% with 21 lines in your changes missing coverage. Please review.

Project coverage is 78.80%. Comparing base (e490082) to head (ecf39ac).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cawg_identity/src/identity_assertion/assertion.rs	75.47%	13 Missing ⚠️
cawg_identity/src/x509/x509_signature_verifier.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #913      +/-   ##
==========================================
- Coverage   78.80%   78.80%   -0.01%     
==========================================
  Files         146      147       +1     
  Lines       34648    34744      +96     
==========================================
+ Hits        27305    27380      +75     
- Misses       7343     7364      +21     

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