[Signalr-Cpp-Client] Cannot close connection if connection state is connecting (deadlock for ~30 secs)

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

When I call Stop() after Start(), and if the internet is slow or the server cannot be connected somehow, the app will be in deadlock for around 30 secs. (which I assume, is the timeout period)

### Expected Behavior

If connection is cancelled after Start() has been processing, Signalr should cancel and stop trying to reach the server immediately instead of waiting for timeout.

### Steps To Reproduce

- call Start() on hub_connection
- make the server cannot connect and keep in connecting state
- call Stop() on hub_connection

### Exceptions (if any)

_No response_

### .NET Version

_No response_

### Anything else?

_No response_