Add worker tagging (#862)

This allows workers to have tags assigned to them, which can then be filtered to control which targets they are allowed to serve.

api/targets/option.gen.go

@@ -158,3 +158,15 @@ func DefaultSessionMaxSeconds() Option {
 		o.postMap["session_max_seconds"] = nil
 	}
 }
+
+func WithWorkerFilter(inWorkerFilter string) Option {
+	return func(o *options) {
+		o.postMap["worker_filter"] = inWorkerFilter
+	}
+}
+
+func DefaultWorkerFilter() Option {
+	return func(o *options) {
+		o.postMap["worker_filter"] = nil
+	}
+}

api/targets/target.gen.go

@@ -27,6 +27,7 @@ type Target struct {
 	HostSets               []*HostSet             `json:"host_sets,omitempty"`
 	SessionMaxSeconds      uint32                 `json:"session_max_seconds,omitempty"`
 	SessionConnectionLimit int32                  `json:"session_connection_limit,omitempty"`
+	WorkerFilter           string                 `json:"worker_filter,omitempty"`
 	Attributes             map[string]interface{} `json:"attributes,omitempty"`
 	AuthorizedActions      []string               `json:"authorized_actions,omitempty"`