Restore "Add pry and pry debuggers to common spree dependencies"

This reverts commit 7006953963f65e69c14c6f88f2a2e87e83d8b20d.

Was breaking CI but that should be fixable by updating bundler on the CI.
Merge pull request #4978 from jordan-brough/restore-pry-debuggers

Restore "Add pry and pry debuggers to common spree dependencies"