@Override
    public Builder toBuilder() {
        return builder().sourceLocation(sourceLocation).url(url).headers(headers).properties(properties);
    }
Get the endpoint {@code authSchemes} property as a map of {@link Identifier} to {@link Literal} values.

@return the list of endpoint {@code authSchemes}.
smithy-rules-engine/src/main/java/software/amazon/smithy/rulesengine/language/Endpoint.java