Windoze Setup Script

[AaronFeledy]

This should resolve #16. I've tested and tweaked to get it working on a bunch of different setups so it should be fairly robust at this point. Once merged a user will be able to install Lando on Windows and their WSL instances using PowerShell:

iex (irm 'https://get.lando.dev/setup-lando.ps1' -UseB)

This PR includes the new script, GHA tests, and an updated windows install doc.

[pirog]

@AaronFeledy this is great! looking forward to diving into it as soon as i can. massive thanks!

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[AaronFeledy]

@pirog This is ready.

It's been updated to use the slim versions by default, it's got tests (which should pass once merged and the script URLs resolve), and I updated the windows install doc. Once this is in, I'll work on that ticket for parity between this and the bash script.