refactor: use plugin annotation types from kubernetes-configuration

[pmalek]

What this PR does / why we need it:

This PR uses functions that interact with objects' plugin annotations from Kong/kubernetes-configuration#144.

Some of those introduce the usage of iterators using the iter package to prevent unnecessary allocations.

Benchmarks

go test -v -benchmem -bench BenchmarkGetPluginRelations -run ^$ -count 1 ./internal/dataplane/kongstate

Old

goos: darwin
goarch: arm64
pkg: github.com/kong/kubernetes-ingress-controller/v3/internal/dataplane/kongstate
cpu: Apple M1 Max
BenchmarkGetPluginRelations
BenchmarkGetPluginRelations-10            243942              4448 ns/op            6912 B/op         64 allocs/op
PASS
ok      github.com/kong/kubernetes-ingress-controller/v3/internal/dataplane/kongstate   1.762s

New

NOTE: the decrease in performance comes from using the interface that contains a method which returns a map vs passing just the map around like it was done previously. If the team feels this is not worth it we can change this back to previous approach. IMHO using the interface makes this more flexible and is worth the small decrease in performance.

Here's a proposal on how to optimize the functions themselves: Kong/kubernetes-configuration@d8803db

goos: darwin
goarch: arm64
pkg: github.com/kong/kubernetes-ingress-controller/v3/internal/dataplane/kongstate
cpu: Apple M1 Max
BenchmarkGetPluginRelations
BenchmarkGetPluginRelations-10            196657              5446 ns/op            9120 B/op         72 allocs/op
PASS
ok      github.com/kong/kubernetes-ingress-controller/v3/internal/dataplane/kongstate   1.849s

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.9%. Comparing base (9517268) to head (3ca92ab).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/util/objectmeta.go	50.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6644     +/-   ##
=======================================
+ Coverage   77.7%   78.9%   +1.1%     
=======================================
  Files        202     202             
  Lines      23758   23798     +40     
=======================================
+ Hits       18483   18794    +311     
+ Misses      4335    4052    -283     
- Partials     940     952     +12     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[czeslavo]

IMHO using the interface makes this more flexible and is worth the small decrease in performance.

👍