Support having multiple paths

[Kayzels]

I've switched over almost entirely to Neovim, but still have some old files using the .vscode directory, so have path set to use that. However, I'd love to be able to set path to be something like .ltex instead, but still be able to use the files already existing in the vscode directory.

Describe the solution you'd like It would be great to define a default path to look for files, and that should be populated, but it should also search in other paths given to find any LTex rules files. So, it should search in .ltex first, but also search for any LTex files in .vscode, and join them together when checking. Not sure if this is something to do with ltex_extra, or the LTex LSP itself.

Describe alternatives you've considered I haven't considered alternatives, because the current way works (with path set to vscode), so this would just be a nice to have.