add explicit implementation for FeatureService

Author: rlindner81

CHANGELOG.md

@@ -9,6 +9,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## v1.2.3 - tbd
 
+### Added
+
+- cds-plugin: added explicit implementation for `FeatureService`.
+
 ### Fixed
 
 - cds-plugin: allow feature toggles to initialize with no configured toggles.

src/service/feature-service.cds

@@ -1,5 +1,6 @@
 @protocol: 'rest'
 
+@impl: '@cap-js-community/feature-toggle-library/src/service/feature-service.js'
 service FeatureService {
     @(requires: ['system-user'])
     function state() returns {};