Add arm64 / M1 MacBook Support (using Parallels Provider)

[tknerr]

This PR adds support for creating the "Linux Developer VM" on M1 MacBooks, using the Vagrant Parallels Provider:

• adds support for parallels provider in general (see Vagrantfile)
• conditionally uses the tknerr/ubuntu2004-desktop-arm basebox when running from an M1 MacBook
• selects the correct .deb installation packages (arm64 vs amd64) for vscode and docker depending on the host architecture
• updates the README and adds documentation on how to export a .pvmp VM image via Parallels (which doesn't support .ova export)

Prerequisites:

• you need Parallels Desktop Business or Pro Edition installed
• you need the vagrant-parallels provider installed

Then run this on a M1 MacBook:

$ vagrant up --provider parallels

[tknerr]

DONE:

• extract separate PR for fixing the pytest issue and ansible-core version check (👉 see PR 47)
• make choice of arm64 vs amd64 .deb packages / shasums dependent on current architecture instead of hardcoding it (👉 see this stackoverflow)
• make basebox selection in Vagrantfile dependent on current architecture (👉 see this solution)
• update README with instructions for parallels provider e.g. how to package it (👉 see blog post and docs)

[tknerr]

@jotbe @mexmirror FYI - it now works on M1 Macbooks :)

For now using parallels provider only, as this is the only M1 basebox I have readily available (built from tknerr/ubuntu#1).

In theory, it should run on M1 with VMware and VirtualBox as well, but I haven't managed to build baseboxes for these providers yet...