[Perl] API methods to optionally return HTTP status code and response headers

[wing328]

We want to leverage wantarray in perl to return (data, http_status_code, http_response_headers) if the context is looking for an array (instead of scalar)

Where to start:

• ApiClient.mustache#L133 should return not only data, but also HTTP status code and HTTP response headers
• api.mustache#L139 updates with wantarray

If you have questions or want to work on this, please reply to let the community know.

Ref: https://github.com/swagger-api/swagger-codegen/wiki/Guidelines-for-Contribution