Request and response models should author `required` properties

[heaths]

Based on feedback about AnswerSpan.confidenceScore being optional in code gen (it should be double not a double?), both request and response models should author required properties like this.

/cc @annatisch

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @bingisbestest, @nerajput1607.

Issue Details

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Based on feedback about AnswerSpan.confidenceScore being optional in code gen (it should be double not a double?), both request and response models should author required properties like this.

/cc @annatisch

Author:	heaths
Assignees:	rokulka
Labels:	Cognitive - QnA Maker, Service Attention
Milestone:	-