Imports of host-functions command

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.
github.com/knqyf263/go-plugin/examples/host-functions/greeting
github.com/knqyf263/go-plugin/types/known/emptypb
ioPackage io provides basic interfaces to I/O primitives.
logPackage log implements a simple logging package.
net/httpPackage http provides HTTP client and server implementations.