Switch to use a library for arguments parsing

[pablitovicente]

As the complexity of the tool increases the flag package from the standard library starts to show its limitations so a better library for command arguments should be selected and implemented.

https://github.com/spf13/cobra is going to be used as this is marked for V2 which can break compatibility, this library is also used by Kubernetes so probably can offer a familiar UX.

These change will transform the multiple tools and binaries that exist today into a single command with sub-commands.

• A single binary will be provided
• Sub-commands generate and check will be initially provided
• To provide a better UX the tool will most probably be renamed