Function indy_sys::anoncreds::indy_issuer_create_credential

#[no_mangle]
pub unsafe extern "C" fn indy_issuer_create_credential(
    command_handle: CommandHandle, 
    wallet_handle: WalletHandle, 
    cred_offer_json: CString, 
    cred_req_json: CString, 
    cred_values_json: CString, 
    rev_reg_id: CString, 
    blob_storage_reader_handle: BlobStorageReaderHandle, 
    cb: Option<ResponseStringStringStringCB>
) -> Error