Imports of package copypropagation

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/open-policy-agent/opa/v1/astPackage ast declares Rego syntax tree types and also includes a parser and compiler for preparing policies for execution in the policy engine.
github.com/open-policy-agent/opa/v1/utilPackage util provides generic utilities used throughout the policy engine.
sortPackage sort provides primitives for sorting slices and user-defined collections.