refactor: Move library packages from internal/ to pkg/

[mflendrich]

This PR moves the following packages:

internal/ingress/controller/parser/kongstate -> pkg/kongstate
internal/ingress/controller/parser -> pkg/parser
internal/ingress/controller/util AND internal/ingress/utils -> pkg/util (merged)
internal/ingress/controller/store -> pkg/store
internal/ingress/annotations -> pkg/annotations

in order to allow for use of KIC's logic (that's not tightly coupled with the controller loop) as a library from an external source (specifically: in an experimental new implementation of the controller).

If the change looks good, it needs to be merged ASAP (and ported to next even ASAPer) because it will cause merge conflicts in all work in flight.

Future work: decouple Kong updating logic from type KongController in internal/ingress/controller.

[codecov]

Codecov Report

Merging #1027 (849cc50) into main (f69ea6f) will not change coverage.
The diff coverage is 36.00%.

@@           Coverage Diff           @@
##             main    #1027   +/-   ##
=======================================
  Coverage   49.65%   49.65%           
=======================================
  Files          32       32           
  Lines        3198     3198           
=======================================
  Hits         1588     1588           
  Misses       1481     1481           
  Partials      129      129           

Impacted Files	Coverage Δ
cli/ingress-controller/flags.go	96.25% <ø> (ø)
cli/ingress-controller/main.go	0.23% <0.00%> (ø)
internal/ingress/controller/controller.go	0.00% <ø> (ø)
internal/ingress/controller/kong.go	6.66% <0.00%> (ø)
pkg/annotations/annotations.go	88.88% <ø> (ø)
pkg/kongstate/consumer.go	75.00% <ø> (ø)
pkg/kongstate/kongstate.go	20.49% <ø> (ø)
pkg/kongstate/route.go	90.32% <ø> (ø)
pkg/kongstate/service.go	80.00% <ø> (ø)
pkg/kongstate/types.go	0.00% <ø> (ø)
... and 14 more

---

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[shaneutt]

LGTM 👍