Refactor Time-related Fields ahead of upcoming improvements

[goosys]

I initially planned to improve the i18n for Time-related fields, but I realized some preliminary refactoring was necessary. I’ve made a few small adjustments and would appreciate your review.

• Ensured consistency across public methods for DateTime, Date, and Time, which each had slight differences.
• Updated Field::Time#time to always go through I18n.localize:
  • Previously, if the format option wasn’t specified, it bypassed translate_localization_format, so AM/PM was not localized.
  • https://www.rubydoc.info/gems/i18n/I18n/Backend/Base:localize
• Removed the default option from I18n.localize:
  • Since an exception is thrown with data.in_time_zone when data is nil, the default option was not meaningful.
• Removed the default value for timezone and removed string conversion with .name:
  • Time.zone is always defined, so a default value is unnecessary.
  • in_time_zone can accept Time.zone objects directly, so string conversion is also unnecessary.
• Added Customer.example_time to the Dashboard in the example app to check the behavior of the Field::Time .
• Added tests
  • Added a test to confirm that the existing behavior remains intact.
  • Also added a test for cases where the am/pm translations are undefined.
    • Since our application operates in non-English locales and always includes the rails-i18n gem, we don’t have to worry about am/pm translations being undefined.

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Next, I’d like to make the following adjustments. What do you think?

• Set options.fetch(:format, :administrate_datetime_default) as the default format value
  • This way, we avoid modifying the :default format used in the main application outside of the Administrate panel.
  • Currently, the Time format is fixed as "%I:%M%p", but in Japanese, we would prefer the order "%p %I:%M". I believe other languages may also have their own preferred orders.
• To use different formats in index and show views, I’d like to allow the format option to be passed into public methods.
  • In the index view, this would allow using field.time(format: :administrate_time_short), while in the show view, simply calling field.time would apply :administrate_time_default.