Imports of package lock

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
database/sqlPackage sql provides a generic interface around SQL (or SQL-like) databases.
errorsPackage errors implements functions to manipulate errors.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/sethvargo/go-retryPackage retry provides helpers for retrying.
timePackage time provides functionality for measuring and displaying time.