Imports of jv command

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/santhosh-tekuri/jsonschema/v5Package jsonschema provides json-schema compilation and validation.
github.com/santhosh-tekuri/jsonschema/v5/httploaderPackage httploader implements loader.Loader for http/https url.
osPackage os provides a platform-independent interface to operating system functionality.