Misc messaging improvements

[jesseleite]

Improve messaging and error output, informing the user as early as possible in the install process...

• Notify when user is running older CLI tool version.
  • This doesn't prevent install, but will show up at the top and bottom of install output.
    
• Handle missing composer auth if starter kit is hosted on github.
  • This does prevent install, but only if a github hosted starter kit is detected.
    
• Explain single-site starter kit license for paid kids.
  • Ask user to confirm that they understand it's a single-use thing, in order to prevent unnecessary support questions and tickets.
    
• Improve UX when running non-interactively.
• Update dependencies to remove certain PHP 8.x deprecations in output.

Do not merge until statamic/cms#5338 is tagged in 3.2!

Closes #43
Closes #44