feat: implement Interactive Authorization flow

[nanderstabel]

Description of change

• Adds support for the Interactive Authorization endpoint (see https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-1_1-wg-draft.html#name-interactive-authorization-e)
• Adds some convenience functions to oid4vc-core/src/utils/did.rs that can be used downstream.

Links to any relevant issues

n/a

How the change has been tested

Added several unit tests

Definition of Done checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.37037% with 72 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
oid4vci/src/wallet/mod.rs	1.58%	62 Missing ⚠️
oid4vci/src/errors.rs	0.00%	8 Missing ⚠️
oid4vci/src/interactive_authorization_request.rs	97.56%	1 Missing ⚠️
oid4vci/src/interactive_authorization_response.rs	98.75%	1 Missing ⚠️

Files with missing lines	Coverage Δ
oid4vc-core/src/jwt.rs	96.05% <100.00%> (ø)
oid4vc-core/src/utils/did.rs	100.00% <100.00%> (ø)
oid4vp/src/token/vp_token_validator.rs	97.22% <100.00%> (-0.03%)	⬇️
oid4vci/src/interactive_authorization_request.rs	97.56% <97.56%> (ø)
oid4vci/src/interactive_authorization_response.rs	98.75% <98.75%> (ø)
oid4vci/src/errors.rs	38.46% <0.00%> (+10.00%)	⬆️
oid4vci/src/wallet/mod.rs	83.02% <1.58%> (-12.23%)	⬇️

... and 1 file with indirect coverage changes

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[Oran-Dan]

TODO comment for the errors should also reference the descriptions that we should add I think but good enough for now. We'll pick that up when we fix the other TODO comment