More useful tags for views

This is a follow-up task that was mentioned in #2074 (where we removed the tag default from all core views).

Now with Views in core and also with admin_views in core, I think that it would make sense to be adding: - a core tag for all views provided by core - a custom tag for all views manually added to the site - a %module name% tag for all views regardless of whether they are core/contrib/custom (we currently have a "Default (module-provided)" indication in the "Storage State" column, which is not very useful, but it would be if the module providing the view was also indicated). If not a tag, this could be a new provided-by property.

As it is now, these tags would have no value, but if we added an instant search filter at the top of the views list (#503), then it would be very useful, because as you must have also experienced yourselves, most sites end up with a few dozens of views.

Anyways, I have previously filed #1897 in which I mention the same issue. Similar/related but different problems.