codeintel: Research adding cmake project configuration inference

Created by: efritz

Determine if cmake configurations have a common generic structure that can be inferred correctly for some non-trivial percentage of repositories.

This issue should be aggressively time-boxed. There may be a step that is non-inteferable, in which case the result of this issue should be a plan to break apart what can be inferred and what needs to be supplied by the user (without requiring full user configuration). (e.g. Can we show the user the inference and have them fill out particular sections that we get wrong?)