Compile an arm64 build for macOS

[liamdawson]

I'm using an M1 Macbook now, and I noticed that DevHub is a bit of an outlier for CPU usage on my machine. I also noticed that it doesn't offer an arm64 build for macOS, so I thought I'd try my hand at making one.

I built a local version of the app from https://github.com/devhubapp/devhub/releases/tag/v0.102.0 using this approach, so you should be able to backport it and cut a new release from that tag (or just build the arm64 artifacts) if you were so inclined.

(I managed to build a universal binary, but that increased the size of the .dmg by ~40%, which felt like an unreasonable amount of overhead)

[jmarbutt]

I feel like the non-arm version is using a significant amount of battery when unplugged, does this help resolve that?

[brentsmith721]

Is there any plans to merge this anytime soon? Just switched to an M1 Macbook and would love to see this.