Publish OpenAPI specification

[thomsonjames]

Is your feature request related to a problem? Please describe.

Many automation systems require swagger files to begin the process of understanding API schemas. We'd like one published in the same manner that AS3 is today.

Describe the solution you'd like

This same thing, but for DO: https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/refguide/apidocs.html

Describe alternatives you've considered

It looks like it's here, but not published in the same format as AS3 https://github.com/F5Networks/f5-declarative-onboarding/blob/master/src/schema/1.28.0/openapi.yaml