Transition to Zeitwerk for Autoloading

[murny]

Update to Zeitwerk: https://github.com/fxn/zeitwerk

• Hopefully minor to no work required
• Cleanup any compatibility issues
• Remove old dependency code (if we have require_dependencies or using eager_load_paths, etc)
• Port over code and refactor our dependency of canonical-rails as this gem does not work with Zeitwerk. See comment (Transition to Zeitwerk for Autoloading #1432 (comment) for more info

[murny]

Will probably need to port over the code we need for our canonical urls as currently this canonical-rails gem will does not seem to work with zeitwerk and no fix on the horizon: jumph4x/canonical-rails#54 (so it's been 7-8 months now since that issue has been created, probably safe to say nothing going to happen anytime soon 🤔)

DEPRECATION WARNING: Initialization autoloaded the constant CanonicalRails::TagHelper.

Being able to do this is deprecated. Autoloading during initialization is going
to be an error condition in future versions of Rails.

Reloading does not reboot the application, and therefore code executed during
initialization does not run again. So, if you reload CanonicalRails::TagHelper, for example,
the expected changes won't be reflected in that stale Module object.

`config.autoloader` is set to `classic`. This autoloaded constant would have been unloaded if `config.autoloader` had been set to `:zeitwerk`.

Please, check the "Autoloading and Reloading Constants" guide for solutions.
 (called from <top (required)> at /Users/murny/Code/jupiter/config/environment.rb:5)

For us think we should just replaced this gem on our side as we use 2 cents of it. It should be very simple, we only need a few things for our canonical helper. So maybe something like this:

  def canonical_href
    "https://era.library.ualberta.ca/#{request_path}"
  end

  private

  def request_path
    return '' if request.path == '/'

    request.path
  end

Which is great, saves us from depending on another gem 😄

Will look into this more when I tackle the issue.

[murny]

This is now merged into master. Closing out issue