Add `is_proc_alive` and `wait_for_proc`

[mirkobrombin]

The following methods can be WineBridge native functions, avoiding timers and increasing performances:

• https://github.com/bottlesdevs/Bottles/blob/5bc8f6e36371ee266ecec10af9cb47a6c4d6d953/src/backend/wine/winedbg.py#L73
• https://github.com/bottlesdevs/Bottles/blob/5bc8f6e36371ee266ecec10af9cb47a6c4d6d953/src/backend/wine/winedbg.py#L126