Enable debugging on windows

[dblnz]

Description

This closes #241

This brings the same debugging behavior to windows guests as kvm and mshv guests have on linux with the following caveat:

• does not support gdb client signals to guests. To enable this we need to find a way to send a signal to the guest vCPU or make it exit. This needs to be sent from the gdb thread in which we do not have a handle to the processor.

Some of the duplicated debug logic that is implemented on each hypervisor driver will be refactored later in a single implementation.