Add WSL2 as a provider

WSL distributions can be fully customized already, see https://docs.microsoft.com/en-us/windows/wsl/build-custom-distro.

This would also enable us to take advantage of some great stuff from WSL2, such as very fast boot time and a good file system integration with Windows.

Also, another good reason is that the VirtualBox won't be able to run in parallel with WSL2 anytime soon (probably), it would be great if we could use WSL2 as a provider replacement.

### Might be useful:

Per distro configuration such as the amount of memory and CPU: https://docs.microsoft.com/en-us/windows/wsl/wsl-config#configure-per-distro-launch-settings-with-wslconf

Import WSL distro from Docker image and vice-versa https://source.coveo.com/2019/10/18/wsl-from-dockerfile/ and https://d3v.one/creating-a-docker-image-from-a-wsl-instance/