`fuelup` - forc binary distribution and toolchain manager

[adlerjohn]

We need a version manager similar to rustup that allows downloading, installing, and managing different versions of the compiler and forc. I suggest calling this forcup.

For now, the version manager should be able to:

• Download a toolchain for a provided architecture from GitHub (depends on Setup CI to automatically publish forc binary for supported architectures under each release sway#1191). The toolchain includes a docs directory.
• Also download plugins (forc-fmt, forc-lsp, etc.).
• Set the default toolchain version.
• Enable reading of the default toolchain version (so that forc can detect when you're using the wrong version that doesn't match what's configured in the manifest file).

[tedbyron]

are there public builds? I'd be interested in making this

[mitchmindtree]

I don't think there are just yet - FuelLabs/sway#1191 is related to this.

[otrho]

fuelup? I know Fuel is waaay more than just Forc and Sway, but still...

[adlerjohn]

Updated the issue description since it was outdated. As @mitchmindtree said, this does depends on binaries being built in CI first.