Implement PID minter & fetcher & provider factories

[mirekys]

Currently we need to repeatedly implement these in each data model, e.g:

def nr_datasets_id_fetcher(record_uuid, data):
    """Fetch a record's identifiers.

    :param record_uuid: The record UUID.
    :param data: The record metadata.
    :returns: A :data:`invenio_pidstore.fetchers.FetchedPID` instance.
    """
    id_field = 'InvenioID'
    return FetchedPID(  # FetchedPID je obyčejný namedtuple
        provider=NRDatasetsIdProvider,
        pid_type=NRDatasetsIdProvider.pid_type,
        pid_value=CommunityPIDValue(
            str(data[id_field]),
            current_oarepo_communities.get_primary_community_field(data))
    )

implement factories to be used like this

nr_datasets_id_fetcher = community_pid_fetcher(pid_type='blah', base_provider=RecordIdProviderV2)
nr_datasets_id_minter = community_pid_minter(pid_type='blah', base_provider=RecordIdProviderV2)