Enable to pull list of all enabled apps over API

[johkoenig]

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Is your feature request related to a problem? Please describe.
This is related to nextcloud/ios#1435. Currently, there is no way to pull a list of all enabled apps. However, this is needed in order to check whether the comments app is enabled. If this is not the case, the comment section shall be hidden in the ios app.

Describe the solution you'd like
Something similar to https://cloud.example.com/ocs/v2.php/core/navigation/apps but for all apps (not only navigation).

Describe alternatives you've considered
Trying to send a comment will trigger a 404. This could be catched and handled accordingly, but thats a huge technical debt.

Additional context
nextcloud/ios#1435
Access to the list of all enabled apps should be limited to logged in users for security reasons.

[szaimen]

Based on this comment it is already possible to do so via the capabilites endpoint:
nextcloud/ios#1435 (comment)