Function indy_credx::prover::create_credential_request

pub fn create_credential_request(
    prover_did: &DidValue, 
    cred_def: &CredentialDefinition, 
    master_secret: &MasterSecret, 
    master_secret_id: &str, 
    credential_offer: &CredentialOffer
) -> Result<(CredentialRequest, CredentialRequestMetadata)>