Start adding support for di_vp DID proof type during OID4VCI.

[dlongley]

Still needs to check proof_type_supported and pick a proof type to default to when it isn't present.

[dlongley]

Addresses #18.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 15.62500% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.83%. Comparing base (81acb0a) to head (79c8337).

Files with missing lines	Patch %	Lines
lib/OID4Client.js	5.26%	54 Missing ⚠️
lib/oid4vci/proofs.js	27.02%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   55.71%   54.83%   -0.88%     
==========================================
  Files          21       21              
  Lines        4119     4205      +86     
==========================================
+ Hits         2295     2306      +11     
- Misses       1824     1899      +75     

Files with missing lines	Coverage Δ
lib/index.js	100.00% <100.00%> (ø)
lib/oid4vci/proofs.js	18.60% <27.02%> (+4.60%)	⬆️
lib/OID4Client.js	7.86% <5.26%> (-0.30%)	⬇️

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