Add ability to remove DY JavaScript code/libraries from specific pages

Generally, most sites won't want or need Dynamic Yield for admin pages, and there should be a checkbox to enable/disable Dynamic Yield for admin pages. I am not sure we need to support custom exclude rules for the public-facing page.

We already to not load DY on admin routes. The presenting issue is that some pages often use the admin theme, such as entity edit forms. This seemed like a simple way to exclude certain path patterns.

We could programmatically detect the active theme, get then name of the admin theme and compare to exclude DY.

What ever we implement, if there is configuration we should collect in via \Drupal\dynamic_yield\Form\FeedSettingsForm and store it in the general settings.