PLT-8131 (part2) Add plugin key value store support (#7902)

* Add plugin key value store support

* Add localization strings

* Updates per feedback

store/storetest/mocks/LayeredStoreDatabaseLayer.go

@@ -221,6 +221,22 @@ func (_m *LayeredStoreDatabaseLayer) OAuth() store.OAuthStore {
 	return r0
 }
 
+// Plugin provides a mock function with given fields:
+func (_m *LayeredStoreDatabaseLayer) Plugin() store.PluginStore {
+	ret := _m.Called()
+
+	var r0 store.PluginStore
+	if rf, ok := ret.Get(0).(func() store.PluginStore); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(store.PluginStore)
+		}
+	}
+
+	return r0
+}
+
 // Post provides a mock function with given fields:
 func (_m *LayeredStoreDatabaseLayer) Post() store.PostStore {
 	ret := _m.Called()