Remove internal annotation
Remove internal annotation

Allow utility to be used outside internal - https://github.com/api-platform/core/issues/1193#issuecomment-430890223
soyuka/core,jdeniau/DunglasApiBundle,soyuka/core,jdeniau/DunglasApiBundle,teohhanhui/api-platform-core,meyerbaptiste/core,teohhanhui/api-platform-core,api-platform/core,api-platform/core,soyuka/core,teohhanhui/DunglasApiBundle,soyuka/core,teohhanhui/api-platform-core,api-platform/core,vincentchalamon/core,vincentchalamon/core,meyerbaptiste/core,api-platform/core,soyuka/DunglasApiBundle,meyerbaptiste/core,vincentchalamon/core,vincentchalamon/core,meyerbaptiste/core,jdeniau/DunglasApiBundle,jdeniau/DunglasApiBundle,teohhanhui/api-platform-core