Imports of package propagators

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
encoding/hexPackage hex implements hexadecimal encoding and decoding.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go.opentelemetry.io/otel/api/propagation
go.opentelemetry.io/otel/api/trace
regexpPackage regexp implements regular expression search.