Enable contract testing on OIDC protected resources

### Reason/Context

The context of the feature request has been discussed here:
https://github.com/orgs/microcks/discussions/1379

### Description

As of today, the Aspire implementation is incomplete: the related model classes are empty.

### Implementation ideas

Complete implementation by describing the missing model properties

https://github.com/microcks/microcks-testcontainers-dotnet/pull/41/files

Start by reviewing the empty Aspire model classes and the context in discussion 1379. Compare the missing model properties with microcks-testcontainers-dotnet pull request 41. Done means the Aspire implementation describes the required properties and supports contract testing on OIDC-protected resources.

Written by the indexing model from the issue text.