Code snippet should be working before LS done resolving Maven dependencies #684

Maven dependencies take lots of time to resolve.

At that moment, LS is not responding to user key strokes. But some of the features like code snippet can acutally work. The idea is to enable some language servers before the project is completely loaded. Code snippet can be a good start because it require less project context. For example, the public_method does not require project context but only the surrounding class.