CLI: adds unpublish command to remove a package from registry

Motivation and Context

We want users to be able to remove a package or it's version from the registry. We dont have a way to do that right now.

Description

This MR adds a unpublish command to the CLI that works very similar to the NPM unpublish command.

Component

• compiler
• website
• webide
• vscode-plugin
• debugger

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance improvement (non-breaking change that improves performance)
• None (change with no changelog)

Changelog

• Group publish, login and add-user commands under a ligo registry subcommand.
• Add ligo registry unpublish command to remove a package or a specific version of it from the registry

Summary

  [--package-name Name]      . of the package on which publish/unpublish is
                               executed
  [--package-version Version]
                             . of the package on which publish/unpublish is
                               executed

To unpublish a package, run ligo registry unpublish --package-name <name> --package-version <version> from anywhere on the CLI (not necessarily from within a project)

Examples,

ligo registry unpublish --package-name foo --package-version 1.0.0

--package-version is optional, omitting which the entire package is unpublished.

Checklist:

• Documentation has been updated.