✨ Add Credentials query

[ccamel]

Context

An axone-vc authority must expose the credentials it issued so governance logic can retrieve credential identifiers matching a given case.

Expected behavior

Add a Credentials query with filtering and pagination.

Credentials {
    filter: CredentialFilter,
    limit: Option<u32>,
    start_after: Option<Uri>,
}

Expected filter shape:

CredentialFilter {
    subject: Option<Uri>,
    credential_type: Option<Uri>,
    valid_at: Option<Timestamp>,
}

The query must return credentials issued by this authority matching all provided filters.

An empty filter must return credentials issued by this authority, using pagination.

The query must support pagination.

Filtering

• subject filters credentials by credential subject identifier.
• credential_type filters credentials by one of the extracted VC type values.
• valid_at filters credentials whose VC validity interval contains the given timestamp.

For valid_at:

• valid_from is inclusive when present.
• valid_until is exclusive when present.
• missing valid_from means no lower bound.
• missing valid_until means no upper bound.

Response

Expected shape:

CredentialsResponse {
    identifiers: Vec<Uri>,
}

Where:

• identifiers = credential identifiers matching the query filters.