Imports of package resolver

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
google.golang.org/grpc/internal/serviceconfigPackage serviceconfig contains utility functions to parse service config.
google.golang.org/grpc/resolverPackage resolver defines APIs for name resolution in gRPC.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.