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Autogenerate a JS module version of cr/ui/store.js and add typechecking.
This is a prerequesite for migrating pages that depend on cr.ui.Store
to Polymer 3, e.g. Bookmarks.

Bug: 1022213
Change-Id: I81634347188232468e851b63859b553c7e33c6a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912693
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714847}