public static boolean isSigV4EquivalentAuthScheme(String authScheme) {
        if (authScheme.equals(SIGV4) || authScheme.equals(SIGV4_SHAPE_ID)) {
            return true;
        }
        if (authScheme.startsWith(SIGV4_SUB) && !authScheme.equals(SIGV4_S3EXPRESS)) {
            return true;
        }
        return false;
    }
Returns if a given auth scheme is equivalent to {@code aws.auth#sigv4}.

@param authScheme name of the auth scheme.
@return whether the auth scheme is equivalent to {@code aws.auth#sigv4}.
smithy-aws-endpoints/src/main/java/software/amazon/smithy/rulesengine/aws/language/functions/EndpointAuthUtils.java