Use `did_you_mean` spell checker for option suggestions #32289
Now that we require Ruby over
There is a small user-visible change and this is that we now offer a
Now that we require Ruby over `2.3`, we can replace the current suggestion methods we have with tooling from the `did_you_mean` gem. There is a small user visible change and this is that we now offer a single suggestion for misspelled options. We are suggesting fixes during generator invocation and during a mistyped rails server rack handler. In both cases, if we don't make a proper prediction on the first match, we won't do so in the second or third one, so in my mind, this is okay.
`DidYouMean::SpellChecker` is not defined. `did_you_mean` is bundled in Ruby but can be uninstalled, and is not always available, sometimes even on our CI: https://travis-ci.org/rails/rails/jobs/372638523#L2405 https://travis-ci.org/rails/rails/jobs/372638523#L2416 https://travis-ci.org/rails/rails/jobs/372638523#L2427 ...