Base.Docs.doc not available during pre-compilation on julia master

[yuyichao]

While Base.Docs.doc (and its alias Base.doc) is defined in Base, all the methods for this function was defined in the REPL stdlib. Because of this, there has always been a hidden/undetected dependency on REPL (from essentially all the packages in this repo).

This implicit dependency break now on julia master after the REPL stdlib got moved out of sysimg (JuliaLang/julia#51399) and importing these packages fail with method error because of this.

It feels a bit stupid to have to use REPL for this but as it stands (and since this has always been how it works) the easiest fix should be to add this REPL dependency explicitly. It seems that adding this dependency (and then import this) in MakieCore should work for now.