Add API for Label templates (#24602)

This adds API that allows getting the Label templates of the Gitea
Instance

routers/api/v1/swagger/misc.go

@@ -48,3 +48,17 @@ type swaggerResponseStringSlice struct {
 	// in:body
 	Body []string `json:"body"`
 }
+
+// LabelTemplateList
+// swagger:response LabelTemplateList
+type swaggerResponseLabelTemplateList struct {
+	// in:body
+	Body []string `json:"body"`
+}
+
+// LabelTemplateInfo
+// swagger:response LabelTemplateInfo
+type swaggerResponseLabelTemplateInfo struct {
+	// in:body
+	Body []api.LabelTemplate `json:"body"`
+}