feat: add gateway api support with httproute resource

[wilmardo]

Used the template and values that come with helm create chart to keep it inline with other charts with two small adaptions:

• added servicePort to the HTTPRoute values
• added labels to the HTTPRoute

Both to keep it functionally the same as the current ingress approach.

Output looks like this with it enabled:

# Source: haproxy/templates/httproute.yaml
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: release-name-haproxy
  labels:
    helm.sh/chart: haproxy-1.26.1
    app.kubernetes.io/name: haproxy
    app.kubernetes.io/instance: release-name
    app.kubernetes.io/version: "3.2.6"
    app.kubernetes.io/managed-by: Helm
spec:
  parentRefs:
    - name: gateway
      sectionName: http
  hostnames:
    - chart-example.local
  rules:
    - matches:
        - path:
            type: PathPrefix
            value: /
      backendRefs:
        - name: release-name-haproxy
          port: 80