Add non-blocking pings

[mgxd]

What would you like to see added in this software?

Currently, the common way to communicate with the server is to call add_project(), which blocks and waits for a server response. In (rare) cases where the server is unavailable, this can cause a delay equal to the value of the request timeout.

I think in the long run, a better solution would be:

• Separate requests where server response is expected from those that it is not (related to Reduce server egress migas-server#66)
• Refactor the request to be done within a concurrent.futures.ThreadPoolExecutor to avoid blocking the main thread.

Do you have any interest in helping implement the feature?

Yes

Additional information / screenshots

No response