Request to support 207 status code for openapi generation

[RakhithaRR]

Description:
When using the ballerina openapi tool to generate a service using the definition in [1], we got the following error.

 HTTP status code '207' is not supported in Ballerina..

[1] - https://github.com/wso2/carbon-apimgt/blob/master/components/apimgt/org.wso2.carbon.apimgt.rest.api.store.v1/src/main/resources/devportal-api.yaml

It would be great if you can introduce the support for 207 status code in Ballerina openapi tool.

Describe your problem(s)

Unable to generate the service skeleton from the openapi definition.

Describe your solution(s)

Ballerina support for HTTP 207 status code

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