chore(gateway-api): Add experimental Gateway API CRDs and v1.4 (#586)

Author: nelsen129

libs/gateway-api/config.jsonnet

@@ -6,6 +6,7 @@ local versions = [
     {output: '1.1', version: '1.1.0'},
     {output: '1.2', version: '1.2.0'},
     {output: '1.3', version: '1.3.0'},
+    {output: '1.4', version: '1.4.1'},
 ];
 
 config.new(
@@ -23,7 +24,7 @@ config.new(
   ] + [
     {
       output: v.output + "-experimental",
-      prefix: '^io\\.k8s\\.networking\\.gateway\\..*',
+      prefix: '^io\\.(x-)?k8s\\.networking\\.gateway\\..*',
       crds: [
         'https://github.com/kubernetes-sigs/gateway-api/releases/download/v%(version)s/experimental-install.yaml' % { version: v.version }
       ],