Add concurrency support

[canytam-krystal]

Is your feature request related to a problem? Please describe.
In order to support more client connection, I want to add the concurrency support to Fooocus. I had tried to add parameter "concurrency_count=N" to the queue() function but the gradio still queue the request.

Describe the idea you'd like
Add a parameter to control the number of concurrency request so the client do not need to wait too long to start.

[mashb1t]

Thank you for providing your ideas, much appreciated.
This is already on the list of potential future enhancements (more or less, concurrency_count might or might not be used and made configurable, as Fooocus currently only supports one GPU + one worker at a time).
Closing as duplicate of #292.