Add feature flag support (#1571)

Author: delvedor

compiler/src/model/build-model.ts

@@ -83,6 +83,9 @@ export function compileEndpoints (): Record<string, model.Endpoint> {
         }
       })
     }
+    if (typeof spec.feature_flag === 'string') {
+      map[api].featureFlag = spec.feature_flag
+    }
   }
   return map
 }

compiler/src/model/json-spec.ts

@@ -32,6 +32,7 @@ export interface JsonSpec {
   }
   stability: model.Stability
   visibility: model.Visibility
+  feature_flag?: string
   headers: {
     accept?: string[]
     content_type?: string[]

compiler/src/model/metamodel.ts

@@ -393,6 +393,7 @@ export class Endpoint {
   since?: string
   stability?: Stability
   visibility?: Visibility
+  featureFlag?: string
   accept?: string[]
   contentType?: string[]
   privileges?: {