Add IngressClass resource and update references to spec.ingressClassName across templates, examples, and documentation for consistency and backward compatibility

- Introduced new IngressClass resource in Helm templates to define `easyhaproxy` as the default ingress class.
- Updated Kubernetes examples to replace `easyhaproxy-ingress` with `easyhaproxy` as the ingress class name.
- Enhanced processor logic to support both the new `spec.ingressClassName` field and the deprecated `kubernetes.io/ingress.class` annotation.
- Revised documentation to reflect the changes and ensure alignment with Kubernetes recommendations.

helm/easyhaproxy/templates/clusterrole.yaml

@@ -28,12 +28,11 @@ rules:
   - list
   - watch
 - apiGroups:
-  - "extensions"
   - "networking.k8s.io"
   resources:
   - ingresses
   # - ingresses/status
-  # - ingressclasses
+  - ingressclasses
   verbs:
   - get
   - list

helm/easyhaproxy/templates/ingressclass.yaml

@@ -0,0 +1,14 @@
+{{- if .Values.ingressClass.create -}}
+apiVersion: networking.k8s.io/v1
+kind: IngressClass
+metadata:
+  name: easyhaproxy
+  labels:
+    {{- include "easyhaproxy.labels" . | nindent 4 }}
+  {{- with .Values.ingressClass.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  controller: byjg.com/easyhaproxy
+{{- end }}