Imports of createtree command

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
errorsPackage errors implements functions to manipulate errors.
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/google/trillianPackage trillian contains the generated protobuf code for the Trillian API.
github.com/google/trillian/clientPackage client verifies responses from the Trillian log.
github.com/google/trillian/client/rpcflagsPackage rpcflags defines flags for configuring RPC clients.
github.com/google/trillian/cmdPackage cmd contains common code for the various binaries in this repository.
google.golang.org/grpcPackage grpc implements an RPC system called gRPC.
google.golang.org/protobuf/types/known/durationpbPackage durationpb contains generated types for google/protobuf/duration.proto.
k8s.io/klog/v2Package klog contains the following functionality:
timePackage time provides functionality for measuring and displaying time.