Move contextual_cueing sources to chrome/browser/glic

This move is in preparation for the fresh implementation of cross-Chrome
contextual cueing in chrome/browser/contextual_cueing. Eventually glic
should migrate to using cross-Chrome cues, but for now the code will
move so that the new cue logic can be built without glic-specific logic
needing to be untangled at every step.

In this change:
* move the sources
* put everything that was in the `contextual_cueing` namespace into the `glic` namespace
* update include paths and build target paths

Bypass-Check-License: moving files
Bug: 487136801
Change-Id: Ida37ca18cc733d7713386d436215d4eedd45009e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7685955
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1603775}