includes: Move osquery/include files into respective CMake targets

[theopolis]

The goal is to move everything from ./osquery/include/osquery to their respective targets, and remove the osquery_headers CMake target.

 rename osquery/{include/osquery => config}/packs.h (98%)
 rename osquery/{include/osquery => core}/core.h (100%)
 rename osquery/{include/osquery => core}/flagalias.h (98%)
 rename osquery/{include/osquery => core}/flags.h (99%)
 rename osquery/{include/osquery => core}/query.h (99%)
 rename osquery/{include/osquery => core}/shutdown.h (100%)
 rename osquery/{include/osquery => core}/system.h (99%)
 rename osquery/{include/osquery => core}/tables.h (99%)
 rename osquery/{include/osquery => database}/database.h (100%)
 rename osquery/{include/osquery => dispatcher}/dispatcher.h (99%)
 rename osquery/{include/osquery => distributed}/distributed.h (99%)
 rename osquery/{include/osquery => events}/events.h (99%)
 rename osquery/{include/osquery => extensions}/extensions.h (98%)
 rename osquery/{include/osquery => logger}/data_logger.h (97%)
 rename osquery/{include/osquery => numeric_monitoring}/numeric_monitoring.h (100%)
 rename osquery/{include/osquery => registry}/registry.h (74%)
 rename osquery/{include/osquery => registry}/registry_factory.h (99%)
 rename osquery/{include/osquery => registry}/registry_interface.h (99%)
 rename osquery/{include/osquery => remote/enroll}/enroll.h (98%)
 rename osquery/{include/osquery => sql}/sql.h (98%)

A step on the path towards detangling (see #5990).

[theopolis]

Let's not merge with rebase. I will have to keep updating this as new PRs are merged and I'd rather not rebase each commit.

[theopolis]

Alright @directionless, ready to land this and then the copyright change soon after.

[directionless]

While this is too giant for me to review in totality, I attempted to filter out what looked like header re-arranging. The remaining diff looked okay. Specifically, I examined 8abb89f by running:

git diff master --unified=0 | grep -vE '^.#include'  | grep -vE '^(---|\+\+\+|@@|index)' 

The resultant diff was ~909 lines. The vast majority of them file names, and a handful of cmake changes.