feat: Support Julia language

[terrytangyuan]

Description

Currently, we only support Python and R (experimental). Let's discuss if there's enough interest to support Julia in this issue.

Please upvote if you are interested in Julia support.

[gaocegege]

We got so many 👍 here

I think we should have a huge refactor to support R/Julia better.

[gaocegege]

def build():
    base(os="ubuntu20.04", language="julia")
    install.julia_packages([
        "Example"
    ])
    shell("zsh")

Julia is supported!

[logankilpatrick]

This is AWESOME!