Add CSP fields to Get Extensions
When I'm building an extension. I use a custom server to help simulate the Twitch Hosted test environment.
To that end it would be useful for me to automatically fetch the new CSP fields from the API
The Endpoint https://dev.twitch.tv/docs/api/reference#get-extensions Get Extensions currently provides a wealth of information about an Extension, including what things are available and enabled and which slots the extension can exist within.
With the Dashboard deployment to allow entry of the new CSP fields. This endpoint should be updated to include the CSP data.
Then I can auto collect the changes into my local test rig and generate a CSP as needed. This is also likely needed for the Developer Rig as well
Also do this to `Get Released Extensions`