Imports of package build

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
cuelang.org/go/cue/astPackage ast declares the types used to represent syntax trees for CUE packages.
cuelang.org/go/cue/ast/astutil
cuelang.org/go/cue/errorsPackage errors defines shared types for handling CUE errors.
cuelang.org/go/cue/parserPackage parser implements a parser for CUE source files.
cuelang.org/go/cue/tokenPackage token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
cuelang.org/go/internalPackage internal exposes some cue internals to other packages.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
pathPackage path implements utility routines for manipulating slash-separated paths.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.
sortPackage sort provides primitives for sorting slices and user-defined collections.
strconvPackage strconv implements conversions to and from string representations of basic data types.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
unicodePackage unicode provides data and functions to test some properties of Unicode code points.