feat: update julia filetype actions

[matthias-Q]

• add julia specific operators
• toggle_multiline
• toggle_boolean for julia

[matthias-Q]

I have updated the actions for julia and added specs.

[CKolkey]

Hell yea.

Unrelated, what in the APL is this:

    ["∉"] = "∈",
    ["∈"] = "∉",

[matthias-Q]

In Julia, you can use all utf-8 characters (functions and variables can be emojis... I don't like it). Some of them are shortcuts for functions: e.g. sqrt(x) can be √x This symbol is the mathematical symbol for "is in" or "is not in" This is the reason why the parser for julia is so huge (58mb parser.c)

[CKolkey]

Ohhh, ok. Ruby lets you do that too, but fortunately all functions are just defined with...words.