Search for credentials stored in wallet.
    Credentials can be filtered by tags created during saving of credential.

    Instead of immediately returning of fetched credentials this call returns search_handle that can be used later
    to fetch records by small batches (with prover_credentials_search_fetch_records).

    :param wallet_handle: wallet handler (created by open_wallet).
    :param query_json: wql style filter for credentials searching based on tags.
        where wql query: indy-sdk/docs/design/011-wallet-query-language/README.md
    :return:
        search_handle: Search handle that can be used later to fetch records by small batches
            (with prover_credentials_search_fetch_records)
        total_count: Total count of records

async def prover_search_credentials(wallet_handle: int,
                                    query_json: str) -> (int, int):
    """
    Search for credentials stored in wallet.
    Credentials can be filtered by tags created during saving of credential.

    Instead of immediately returning of fetched credentials this call returns search_handle that can be used later
    to fetch records by small batches (with prover_credentials_search_fetch_records).

    :param wallet_handle: wallet handler (created by open_wallet).
    :param query_json: wql style filter for credentials searching based on tags.
        where wql query: indy-sdk/docs/design/011-wallet-query-language/README.md
    :return:
        search_handle: Search handle that can be used later to fetch records by small batches
            (with prover_credentials_search_fetch_records)
        total_count: Total count of records
    """

    logger = logging.getLogger(__name__)
    logger.debug("prover_search_credentials: >>> wallet_handle: %r, query_json: %r",
                 wallet_handle,
                 query_json)

    if not hasattr(prover_search_credentials, "cb"):
        logger.debug("prover_search_credentials: Creating callback")
        prover_search_credentials.cb = create_cb(CFUNCTYPE(None, c_int32, c_int32, c_int32, c_uint))

    c_wallet_handle = c_int32(wallet_handle)
    c_query_json = c_char_p(query_json.encode('utf-8'))

    res = await do_call('indy_prover_search_credentials',
                        c_wallet_handle,
                        c_query_json,
                        prover_search_credentials.cb)

    logger.debug("prover_search_credentials: <<< res: %r", res)
    return res