Support querying all UGC

[Seeker14491]

What problem is this feature trying to solve?

Currently there's no way to query all UGC for a given application.

How would you like it to be solved?

The Steamworks API provides the CreateQueryAllUGCRequest() method in the ISteamUGC interface, which allows querying all UGC for an application. SteamKit would emulate this functionality to implement the feature.

Have you considered any alternative solutions

The Steam Web API provides this functionality, but the relevant endpoints require a publisher API key, so it's not an alternative.

Additional Information

No response

[otherstopsail]

How to fix the error encountered when querying all UGC? eggy car