public void setAlphanumericOnlyRefs(boolean alphanumericOnlyRefs) {
        this.alphanumericOnlyRefs = alphanumericOnlyRefs;
    }
Creates shape name pointers that strip out non-alphanumeric characters.

<p>This is necessary for compatibility with some vendors like
Amazon API Gateway that only allow alphanumeric shape names.

@param alphanumericOnlyRefs Set to true to strip non-alphanumeric characters.
smithy-jsonschema/src/main/java/software/amazon/smithy/jsonschema/JsonSchemaConfig.java