Return the value for `key` of membersuite_object_data.

def value_for_key(membersuite_object_data, key):
    """Return the value for `key` of membersuite_object_data.
    """
    key_value_dicts = {
        d['Key']: d['Value'] for d
        in membersuite_object_data["Fields"]["KeyValueOfstringanyType"]}
    return key_value_dicts[key]