Add Gateway API support

[pmarques]

Description

This PR introduces support for Kubernetes Gateway API by adding an HTTPRoute resource, providing an alternative to traditional Ingress for routing HTTP traffic to the Zigbee2MQTT UI.

This enhancement allows users to adopt Gateway API routing while maintaining backward compatibility with existing Ingress setups.

Usage

Example of values required to enable the Gateway API HTTPRoute:

httproute:
  enabled: true
  parentRefs:
    - name: my-gateway
      namespace: gateway-system
  hostnames:
    - zigbee2mqtt.example.com

[pmarques]

Gentle reminder @jlpedrosa

[jlpedrosa]

Thanks!! sorry for the delay! LGTM, but could you run the make target to update the docs?

[pmarques]

@jlpedrosa docs updated

[jlpedrosa]

LGTM, Thanks!

[Koenkk]

Thanks!