Allow resolution/selection of API version in SwaggerHub Integration for Confluence

Would be useful to allow just the base url to a SwaggerHub API to be specified in the widget configuration.

For example: https://api.swaggerhub.com/apis/acme/products

Rather than: https://api.swaggerhub.com/apis/acme/products/1.1.0

When the Confluence page is later browsed (and assuming the url is to SwaggerHub), then the default API version should be automatically resolved. This would allow the current state of the API to be reflected in Confluence without requiring new edits every time a new version is published in SwaggerHub.

An extension to this would be to allow the users to choose from the different published versions when browsing the page. This should be an opt-in feature on the widget configuration.