feat: attachments support

[skynet2]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.90%. Comparing base (e4f97de) to head (2047504).
Report is 5 commits behind head on main.

Files	Patch %	Lines
pkg/service/oidc4vp/attachments.go	93.18%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1738      +/-   ##
==========================================
+ Coverage   85.82%   85.90%   +0.07%     
==========================================
  Files         182      183       +1     
  Lines       12560    12658      +98     
==========================================
+ Hits        10780    10874      +94     
- Misses       1313     1315       +2     
- Partials      467      469       +2     

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