* from-eml initial ver
* Adding tests for `from-eml`
* Add eml to prepares_and_decorates_filesystem_source_files
* Sort the file order
Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>
This improves incremental build time when working on what was previously
the root package. For example, previously all plugins would be rebuilt
with a change to `src/commands/classified/external.rs`, but now only
`nu-cli` will have to be rebuilt (and anything that depends on it).
