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Prior to this CL, the previous implementation of imperative slot API uses
'slotting' as an optional parameter for Element.attachShadow(). However,
based on the feedback by JanMiksovsky@ in
https://github.com/w3c/webcomponents/pull/866, the parameter should be
changed to 'slotAssignment' to make it align with other members,
assignNodes(), assignElements(). I agree with this feedback.

This CL updates the following:
1. update bindings where the previous 'slotting' was used to
 'slotAssignment'.
2. Updated the enum type of slotAssignment. It should be,
 SlotAssignmentMode [auto | manual].
3. Added attribute 'slotAssignment' to Shadow_Root.idl and updated
 global-interface-listing-expected.txt.
4. Modify existing tests from using slotting to slotAssignment.
5. Removed test that'll be covered by
 external/wpt/shadow-dom/slots-imperative-slot-api.tentative.html.
https://chromium-review.googlesource.com/c/chromium/src/+/2083742
I'll update this CL with the correct
 slots-imperative-slot-api.tentative-expected.txt once that CL lands.

Bug: 869308
Change-Id: I0fb1a9e11c88d52fc0b0570f3f3e1f5bf834f858
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2084376
Commit-Queue: Yu Han <yuzhehan@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748116}