Extend NGINXProxy with waf enabled toggle

[ciarams87]

As a user
I want to be able to toggle WAF protection on for my Gateway
So that my dataplane deployment is running with the NAP engine enabled

Acceptance

• Extend NGINXProxy to provide a configuration option to enable WAF, and to support optional setting of other WAF related fields, e.g.

apiVersion: gateway.nginx.org/v1alpha2
kind: NginxProxy
metadata:
  name: nginx-proxy-waf
  namespace: nginx-gateway
spec:
  # WAF policy configuration (extensible design)
  waf: "Enabled"  # "Enabled" | "Disabled"
# configuration tweaks optional, e.g.:
#   kubernetes:
#     deployment:
#       # NGINX container with NAP module (will set to default if waf is "Enabled" but these values are not configured)
#       container:
#         image:
#           repository: private-registry.nginx.com/nginx-gateway-fabric/nginx-plus-waf
#           tag: "2.1.0"

#       # NAP v5 required containers (will set to defaults if waf is "Enabled" but these values are not configured)
#       wafContainers:
#         enforcer:
#           image:
#             repository: private-registry.nginx.com/nap/waf-enforcer
#             tag: "5.6.0"

#         configManager:
#           image:
#             repository: private-registry.nginx.com/nap/waf-config-mgr
#             tag: "5.6.0"

• Update the provisioner to conditionally deploy WAF containers as part of the NGINX deployment when waf is enabled