Revisit CLI flags parsing #47
Description
There is a dual way to get flags with env&cli args and YAML config, this combines cobra and viper, we might consider something unified or cleaner. Example related code https://github.com/konveyor-ecosystem/kubectl-migrate/pull/44/changes#diff-ce39d5c9893fdbe876354feb12f9efe7a4b2773e83d88fff2a34b4902e3f89f3R27-R28 more in primary export, transform and apply packages with their subcommands.
Related changes #44 importing crane and also crane history with this including migtools/crane#68