feat: OID4VC, OID4VP and X509 capabilities - experimental feature

[RinkalBhojani]

What?

Below features are added for experimental purpose. Functionalities are working but may have some issues

• OID4VC
• OID4VP
• X509

Summary by CodeRabbit

• New Features

  • Added OpenID4VC issuer management with credential template and offer lifecycle support.
  • Added OpenID4VP verifier support for verification sessions and presentations.
  • Added X.509 certificate creation, import, and lifecycle management.

• New Services

  • Introduced oid4vc-issuance microservice for credential issuance workflows.
  • Introduced oid4vc-verification microservice for presentation verification workflows.
  • Introduced x509 microservice for certificate management.

• Configuration

  • Added experimental OIDC controller visibility toggle via HIDE_EXPERIMENTAL_OIDC_CONTROLLERS flag.
  • Extended environment configuration with service-specific NKEY seeds.

• API Gateway

  • Added REST endpoints for issuer, template, and credential offer management.
  • Added REST endpoints for verifier and verification session management.
  • Added REST endpoints for X.509 certificate operations.

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