[Feature] Create Completion Service

[jonnyboyC]

Is your feature request related to a problem? Please describe.
Currently the auto completion functionality is somewhat of a message and scattered about the codebase. This is essentially true in the serverUtils.ts where KLS which in all other cases is the root object is actually passed as a parameter.

Describe the solution you'd like
Create a new completionService that encapsulates all the current completion functionality and allows more strategies to be incorporated. This is especially the case with ksconfig.json, directives and path completions.