Add request retry with backoff when encountring 429 errors

[snatchev]

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 see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Fixes #13841

This PR attempts to handle 429 "Too Many Requests" errors when using the App Store Connect API. The default request quota offered by the App Store Connect API is 3600 / hour. Requests will back off, with doubling delays, until 3600 seconds is reach after which it will give up.

Description

Testing Steps

[joshdholtz]

This looks good to me! 😊 And makes total sense 💪

[snatchev]

Thank you so much @joshdholtz!!