Add page action controller for product specifications

Also hooks it up with the product specifications icon to let the page
action controller control the visibility and expansion of the icon.

Two things worth mentioning about the icon after this patch:
* For expansion priority, product specification is lower than discount
but higher than any other shopping page action.
* When expanded, product specification icon will not collapse as time
goes by.

Bug: b/325660810
Change-Id: I169d2a2024b76d210bf5301d7212ec703177475d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5541732
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Emily Shack <emshack@chromium.org>
Commit-Queue: Yue Zhang <yuezhanggg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1302873}