Add config.action_dispatch.cookies_default_options

[hugopeixoto]

Right now, cookie attributes could be set on each individual cookie by using:

cookies[:commenter_name] = { value: "david", path: "/blog/" }

This PR allows these attributes to be set globally in an initializer:

Rails.application.config.action_dispatch.cookies_default_options = {
  path: "/admin/",
  expires: -> { 1.day.from_now }
}

It supports Proc objects to delay execution to run time (vs initialization time).

This was particularly helpful when hosting a Rails app under a subdirectory, to avoid cookie collisions with other apps in different paths.

This PR is a new version of #27439. I had deleted the original fork so I don't know how I can reuse the issue.

I have tried to address @gmcgibbon's review notes, but I don't know how to interpret this comment:

#27439 (comment)

[rails-bot]

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