Function receive_oid4vci_credential 

pub async fn receive_oid4vci_credential<S: WalletStore>(
    store: &S,
    response: &CredentialResponse,
    format_hint: &str,
) -> Result<Vec<CredentialId>>

Receive credentials from an OID4VCI response and store them.

Returns the list of newly stored credential IDs. For deferred responses (no credentials, has transaction_id), returns an empty vec.