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First pass in adding JavaScript framework detections to UKM. This patch creates a UKM and adds a loading behavior flag for when Next.js is detected on a page.

UKM collection review doc: https://docs.google.com/document/d/1eatNgsHthqcSaocbevAslky0kb7WqGP4_DT9HorGAQc/edit?usp=sharing

Bug: 1006274
Change-Id: I8e645b80d0a2cb5f569c3c413f76345ca75c7995
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2294392Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Houssein  Djirdeh <houssein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795915}