Add Early Access Features for PostHug provider

[vody]

Is your feature request related to a problem? Please describe.
As an ISV provider, we want to enable early access scenarios for feature flags. This requires allowing users to select features which why would like to enable.

Describe the solution you'd like
PostHug now has a Early Access Feature Management, which enables such a scenario from backed. We would like this to be included in a current app. So then the user would be able to enable such a feature for himself or for his organization from a Features page.