Issue

The endpoint logic of API has been deported to a module and core foundation of the API can therefor be added to the software definitely. The API can still be disabled if needed

Specs

Remove the feature auth server in the feature and experimental page.
Keep the feature flag about the multistore but rename it "Admin API - Multistore"
Rename "Auth Server" page to "Admin API" above bellow Webservice Page,

Add new card on the bellow of the API client list.

The new card is named "Configuration" with the configuration icon and be composed with a toggle to enable and disable the API.
The toggle is named "Admin API", the input can be "Enabled" or "Disabled"
The help text is:
"Before enabling the Admin API, you must be sure to:

1. Check that the ps_apiressource is installed and enabled.
2. Check that URL rewriting is available on this server.
3. Check that the six methods GET, POST, PUT, PATCH, DELETE and HEAD are supported by this server.
   The multistore is still on beta, to test it out go the "New & Experimental features" page*

Upgrade module need to be adapted accordingly.
The default value for new shops will be enabled

Acceptance test

When the Admin API is enabled
Then API can interrogate
Else the API won't be access and throw a denied access 404