forked from extern/nushell
migrate `size` command to engine-p. I also tweaked the signature of the primary logic (`size`) to mimic `keep`. Part of #3390.
nu-command
The Nu command crate contains the full set of internal commands, that is, the commands that can be form the set of built-in commands in a Nushell engine.
The default set of commands that Nushell ships with can be found in the default context.
The commands themselves live in the commands module.