chore: post refactor CLI

[ematipico]

What kind of change does this PR introduce?

Refactor:

• moved the cli package under webpack-cli, more intuitive
• removed libraries update-notifier, semver and terser-webpack-plugin
  • semver: not needed at the moment. We use it just for one check. We already specify the engine inside the package.json
  • update-notifier: it's nice but not essential. Let's save space
  • terser-webpack-plugin: webpack already applies minification when the mode is production. Not needed
• moved from inquirer to enquirer: smaller, less dependencies and same functionality (thank you @rishabh3112 for the suggestion)

Did you add tests for your changes?
No

If relevant, did you update the documentation?
Not needed

Summary
The cli folder doesn't respect the name inside package.json. That's why I moved it under webpack-cli folder. Also, I decided to remove some libraries that are not essential to the CLI and that could save us some space.

I also ditched inquirer for a more lighter version: enquirer. It has the same functionalities and is lighter is terms of dependencies and weight.

Does this PR introduce a breaking change?

No

Other information

[webpack-bot]

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[rishabh3112]

Looks good to me

[rishabh3112]

Thanks!