Add moonx binary entry to package.json

[jamestalmage]

Link moonx for folks who install via a node package manager.

[milesj]

@jamestalmage I actually had this before but it breaks the moon binary, since npm is dumb and doesn't know what the "default" bin is anymore.

npm's logic is stupid, as the default bin name === the package name, and since the package name isn't "moon" this won't work.

[jamestalmage]

I'm doing this (installing multiple binaries) in internal command line packages, and it works fine in npm 11.2

[jamestalmage]

Confirmed that this works for moon.

npm install @jamestalmage/moonrepo-cli

Running moonx gives expected results

[milesj]

I wonder if they fixed this in latest npm. Will need to also verify older versions of npm, and then pnpm/yarn.