[Feature] Support git worktrees along workspace folders

[asmodeus812]

This is something that has been bugging me for a while, with JDTLS, it is impossible to work on several git worktrees of the same project at the same time, you have to either restart the client when opening a new git worktree, (not open the others, or first open the one you want to work on), the other option is if the client supports it to remove the workspaces from the other worktrees. In either case if you have already imported one git worktree 'version' of the project, any other git worktree opened afterwards of the same project, would be reported as 'not recognized as a java project'

Here is a related discussion from emacs/lsp - emacs-lsp/lsp-java#247