Prettify diff generated by git for encripted file:

- @sinsoku had the idea and started implementing it few months ago
  but sadly didn't finish it.
  This PR is taking over his work.

  The credentials feature has changed a lot since @sinsoku opened hi
  PR, it was easier to just restart from scratch instead of checking
  out his branch.
  Sinsoku will get all the credit he deserves for this idea :)

  TL;DR on that that feature is to make the `git diff` or `git log`
  of encrypted files to be readable.

  The previous implementation was only setting up the git required
  configuration for the first time Rails was bootstraped, so I decided
  to instead provide the user a choice to opt-in for readable diff
  credential whenever a user types the `bin/rails credentials:edit`
  command.
  The question won't be asked in the future the user has already
  answered or if the user already opted in.

  Co-authored-by: Takumi Shotoku <insoku.listy@gmail.com>

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