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Specifically, when the PrivacySettingsRedesign flag is on:
 - Split content settings types to two categories "permissions"
   and "content settings"
 - Within each category show 5 items by default, and place all remaining
   items within an expandable section.

Achieved by introducing a new settings-site-settings-list custom
element, and moving some logic previously in site-settings-page to
the new element.

The old codepath where PrivacySettingsRedesign is off, is also
leveraging the newly introduced settings-site-settings-list element.

Bug: 1032584
Change-Id: Id7c7b3d01aa319371374ae1379ea617703934abb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065338
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744075}