refactor(cli-utils): Refactor CLI entrypoint and remove exports

[kitten]

Summary

This basically aims to achieve three things:

• Remove exports so we can revisit: RFC: Exposing the generate-schema and generate-output actions from cli-utils as Node.js API's #134 (comment)
  • I think we can either abstract into @gql.tada/internal (pretty complex tbf)
  • or; we can just provide an api/ folder in cli-utils and make proper variants, so we still have some options in altering CLI outputs
• Replace sade with clipanion to split up the commands and have some more QoL features available and abstracted away (sub commands, validation)
• Add/Fix some more CLI options and add some stdout pipe options

This doesn't yet:

• Remove warnings, swapping them out with errors and null/undefined return values here and there
• Update the CLI outputs with new colorisers
• Investigate/Fix why init has no styling
• Resolve some todos and add extra CLI options
• Add a custom help command / output

Set of changes

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Latest commit: 28cf9dc

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