Imports of count command

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
flagPackage flag implements command-line flag parsing.
github.com/mongodb/mongo-go-driver/bson
github.com/mongodb/mongo-go-driver/core/command
github.com/mongodb/mongo-go-driver/core/connstring
github.com/mongodb/mongo-go-driver/core/description
github.com/mongodb/mongo-go-driver/core/dispatch
github.com/mongodb/mongo-go-driver/core/session
github.com/mongodb/mongo-go-driver/core/topology
github.com/mongodb/mongo-go-driver/core/uuid
logPackage log implements a simple logging package.
timePackage time provides functionality for measuring and displaying time.