Added in some missing fields from the response definition in typescript.

[genixpro]

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[genixpro]

I have signed the contributor agreement.

[googlebot]

CLAs look good, thanks!

[Joaojuby]

Anyone has any idea when this will be implemented? Also I'd love to be able to send a contextOut back to dialogflow. Maybe I can already do it but just reading through the source files I can't properly find it nor is it referenced on the documentation