public Builder putRequestTemplate(String mimeType, String template) {
            requestTemplates.put(mimeType, template);
            return this;
        }
Adds a request template.

@param mimeType MIME type of the request template to set.
@param template Request template to set.
@return Returns the builder.
@see IntegrationTrait#getRequestTemplates()
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/MockIntegrationTrait.java