Imports of package metadata

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
google.golang.org/grpc/internalPackage internal contains gRPC-internal code, to avoid polluting the godoc of the top-level grpc package.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.