adapt default environment to julia version

[gdkrmr]

lsp-julia-default-environment contains the julia version number and if we want to set it automatically, we have to query the julia version or similar.

The Julia version number can be queried via:

julia -e "println(VERSION.major, '.', VERSION.minor)"

or

julia -e "println(dirname(Base.load_path()[1]))"

#25 (comment)

[non-Jedi]

You could also do as we do with eglot-jl and let julia determine the appropriate project instead of doing it manually in elisp: https://github.com/non-Jedi/eglot-jl/blob/84cff9d6ef1643f3eac6c9d620cc1e380a9847d9/eglot-jl.jl#L27

[gdkrmr]

Thanks for the tip. I was wondering for a while, if there is any value in making this configurable. If you want to change the default environment with eglot-js, you just use an environmental variable, right?