[Equipment] Connect process cannot be cancelled

[JohannesWorks]

Description
Once a connect attempt is started, there is no way to cancel it. The user has to wait until NINA runs into its timeout (~5 min). A cancel button should be added.

[christian-photo]

On a high level this will be supported in the upcoming v3. However it needs to be supported at a driver level as well and many drivers do not implement cancellation