Add moon to comparison doc

[milesj]

Doc: https://github.com/practicajs/practica/blob/main/docs/docs/decisions/monorepo.md

Moon, a build system written in Rust, was released a few months ago. Would be great to add it to the doc above.

There's also a feature comparison doc already that would be great starting point: https://moonrepo.dev/docs/comparison

[goldbergyoni]

@milesj Looks like a very promising offering, happen to have some YouTube or quick summary that outlines the project unique value?

I'd love to collaborate and evaluate future partnership

For now, we can add to the table only top 5 downloaded vendors:
https://github.com/practicajs/practica/blob/main/docs/docs/contribution/vendor-pick-guidelines.md