[spaceship] add basic support for retrieving TestFlight Feedback screenshots via ConnectAPI

[max-ott]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Adds basic support for retrieving TestFlight Feedback (screenshots, comments, etc.) with regards to #15771

⚠️Even though this uses the App Store Connect API through ConnectAPI, this is not a documented and public feature of the API.

Testing Steps

lane :connect_feedback do
  fastlane_require 'spaceship'

  Spaceship::Tunes.login
  Spaceship::Tunes.select_team

  # Gets app
  app = Spaceship::ConnectAPI::App.find(ENV["TEST_APP_BUNDLE"])

  # Gets feedback for an app (default includes screenshots and tester info)
  feedbacks = app.get_beta_feedback

  # Iterate over feedbacks
  feedbacks.each do |feedback|
    puts ""
    puts "comment: #{feedback.comment}"
    puts "name: #{feedback.tester.first_name} #{feedback.tester.last_name}"
    puts "email: #{feedback.tester.email}"
    puts "build: #{feedback.build.version}"

    # Iterate over feedback screenshots
    feedback.screenshots.each do |screenshot|

      # screenshot.image_assets is an array of different resolults of a screenshots
      image_asset = screenshot.image_assets.first

      puts "\turl: #{image_asset["url"]}"
      puts "\twidth: #{image_asset["width"]}"
      puts "\theight: #{image_asset["height"]}"
    end
  end
end

[21:32:34]: Driving the lane 'connect_feedback'
[21:32:42]:
[21:32:42]:comment: And more feedback
[21:32:42]:name: Josh Holtz
[21:32:42]:email: josh+dev@rokkincat.com
[21:32:42]:build: 1571678363
[21:32:42]:
[21:32:42]:comment: Oohhhhh feedback!!!!
[21:32:42]:name: Josh Holtz
[21:32:42]:email: email@email.com
[21:32:42]:build: 1571678363
[21:32:42]:     url: https://tf-feedback.itunes.apple.com/blahblahblah
[21:32:42]:     width: 3024
[21:32:42]:     height: 4032

[googlebot]

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[joshdholtz]

@googlebot I consent.

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[joshdholtz]

@max-ott Updated this with some tests, model helpers, and new screenshot model. Do you mind taking a look when you have time? 😊

[joshdholtz]

Thanks for doing the work on this PR! Really appreciate it like always 😊❤️

[fastlane-bot]

Congratulations! 🎉 This was released as part of fastlane 2.138.0 🚀