Imports of render command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/google/trillian/docs/claimantmodel/experimental/cmd/render/internalPackage claimant is a code model for the Claimant Model.
gopkg.in/yaml.v2Package yaml implements YAML support for the Go language.
k8s.io/klog/v2Package klog contains the following functionality:
osPackage os provides a platform-independent interface to operating system functionality.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.