feat: add ubi backend for eza

[yodatak]

by the way should we remove exa because its unmaintend ? https://github.com/ogham/exa

[jdx]

by the way should we remove exa because its unmaintend ? https://github.com/ogham/exa

yes

[jdx]

btw if you wouldn't mind, run mise run render to generate the docs when making these changes. Not super important because it'll happen later, but this groups the change in the correct pr.

[jimeh]

This sadly seems to break the eza shorthand on macOS, as the official eza repository does not provide binaries for macOS in their releases.

There's been issue open about it since September 2023: eza-community/eza#228

The asdf plugin worked around this by downloading binaries from cargo-bins/cargo-quickinstall, but I doubt that's a viable solution here.

@jdx do you have any minimum set of supported platforms/architectures in mind for tools before ubi as the default backend is viable? Personally I'd assume at least linux and macOS would be desirable, though that's mostly because I use mise on both daily.