Refactor reconcilers and implementations (nginx#250)

Previously, all reconcilers and implementations looked almost the same.

This commit:
- Replaces all reconcilers with a single one.
- Removes all implementations. Now the reconciler sends upsert and
delete events to the event channel instead of the implementations.
The sending to the events part of the reconciler doesn't have
the shutdown bug (a possibility to hang while sending to the channel
during the shutdown) all implementations shared.
- Removes the sdk package.

Additionally, the Manager now uses the same logger as the other
components.

go.mod

@@ -10,9 +10,9 @@ require (
 	github.com/onsi/ginkgo/v2 v2.3.1
 	github.com/onsi/gomega v1.22.1
 	github.com/spf13/pflag v1.0.5
-	golang.org/x/net v0.0.0-20220722155237-a158d28d115b
 	k8s.io/api v0.25.3
 	k8s.io/apimachinery v0.25.3
+	k8s.io/client-go v0.25.3
 	sigs.k8s.io/controller-runtime v0.13.0
 	sigs.k8s.io/gateway-api v0.5.1
 )
@@ -55,6 +55,7 @@ require (
 	go.uber.org/multierr v1.7.0 // indirect
 	go.uber.org/zap v1.21.0 // indirect
 	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
 	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect
 	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
@@ -69,7 +70,6 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/apiextensions-apiserver v0.25.0 // indirect
-	k8s.io/client-go v0.25.0 // indirect
 	k8s.io/component-base v0.25.0 // indirect
 	k8s.io/klog/v2 v2.70.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect

go.sum

@@ -629,8 +629,8 @@ k8s.io/apiextensions-apiserver v0.25.0 h1:CJ9zlyXAbq0FIW8CD7HHyozCMBpDSiH7EdrSTC
 k8s.io/apiextensions-apiserver v0.25.0/go.mod h1:3pAjZiN4zw7R8aZC5gR0y3/vCkGlAjCazcg1me8iB/E=
 k8s.io/apimachinery v0.25.3 h1:7o9ium4uyUOM76t6aunP0nZuex7gDf8VGwkR5RcJnQc=
 k8s.io/apimachinery v0.25.3/go.mod h1:jaF9C/iPNM1FuLl7Zuy5b9v+n35HGSh6AQ4HYRkCqwo=
-k8s.io/client-go v0.25.0 h1:CVWIaCETLMBNiTUta3d5nzRbXvY5Hy9Dpl+VvREpu5E=
-k8s.io/client-go v0.25.0/go.mod h1:lxykvypVfKilxhTklov0wz1FoaUZ8X4EwbhS6rpRfN8=
+k8s.io/client-go v0.25.3 h1:oB4Dyl8d6UbfDHD8Bv8evKylzs3BXzzufLiO27xuPs0=
+k8s.io/client-go v0.25.3/go.mod h1:t39LPczAIMwycjcXkVc+CB+PZV69jQuNx4um5ORDjQA=
 k8s.io/component-base v0.25.0 h1:haVKlLkPCFZhkcqB6WCvpVxftrg6+FK5x1ZuaIDaQ5Y=
 k8s.io/component-base v0.25.0/go.mod h1:F2Sumv9CnbBlqrpdf7rKZTmmd2meJq0HizeyY/yAFxk=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=