Make it possible to retrieve all applications in an AppD

[kriswest]

Enhancement Request

A common use case for the AppD is providing a list of all available applications to a desktop agent. However, there currently exists no endpoint for retrieving a listing of all applications. AppD implementations may currently be providing this feature by supporting calls to the search endpoint with no parameters, however, this feels contrary to the purpose of that endpoint (to allow searching of filtering and the return of a subset of applications).

Add support for an endpoint that returns all application details, e.g. GET /<version>/apps

Use Case:

• Retrieving details of all applications available in an AppD (to the logged-in user if authentication is in use) in order to populate a launcher menu or app catalog user interface.