refactor: use new protoc plugin for api v2 (#5798)

* refactor: use new protoc plugin for api v2

* simplify code

internal/protoc/protoc-gen-zitadel/zitadel.pb.go.tmpl

@@ -0,0 +1,29 @@
+// Code generated by protoc-gen-zitadel. DO NOT EDIT.
+
+package {{.GoPackageName}}
+
+import (
+	"github.com/zitadel/zitadel/internal/api/authz"
+    {{if .AuthContext}}"github.com/zitadel/zitadel/pkg/grpc/object/v2alpha"{{end}}
+)
+
+var {{.ServiceName}}_AuthMethods = authz.MethodMapping {
+    {{ range $m := .AuthOptions}}
+        {{$.ServiceName}}_{{$m.Name}}_FullMethodName: authz.Option{
+            Permission: "{{$m.Permission}}",
+            CheckParam: "{{$m.CheckFieldName}}",
+        },
+    {{ end}}
+}
+
+{{ range $m := .AuthContext}}
+func (r *{{ $m.Name }}) OrganisationFromRequest() *object.Organisation {
+    return r{{$m.OrgMethod}}
+}
+{{ end }}
+
+{{ range $resp := .CustomHTTPResponses}}
+func (r *{{ $resp.Name }}) CustomHTTPCode() int {
+    return {{$resp.Code}}
+}
+{{ end }}