nu-cmd-extra

The commands in this crate are the extra commands of Nushell. These commands are not in a state to be guaranteed to be part of the 1.0 API; meaning that there is no guarantee longer term that these commands will be around into the future.

For a while we did exclude them behind the --features extra compile time flag, meaning that the default release did not contain them. As we (the Nushell team) shipped a full build including both extra and dataframe for some time, we chose to sunset the extra feature but keep the commands in this crate for now. In the future the commands may be moved to more topical crates or discarded into plugins.