Create an open command

[Tallented-Code-bot]

Create a new command called jd open. This would open a file/directory of a JD number in the default application.

Considerations:

• Without any argument it would open the directory, probably in a file explorer.
• With a file argument it would try to open that file. The file argument could be a regex/glob.
• It would need to work on Linux, Mac, and Windows. There may be a rust crate to do this; if not, you can certainly use xdg-open on linux; I don't know about mac or windows.