[RPP] Add live metrics experiment to the performance panel This uses the web-vitals library to install live metric listeners on the target page and surface them on the performance panel landing page. Other supplemental data is included such as the LCP element. The initial UI is extremely simple but we will continue to iterate on that behind the experiment. Histogram CL: https://crrev.com/c/5579296 Bug: 313906462 Change-Id: Idb6aaaa1a0d5f542a1767218e3f8f4483d010658 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5568374 Commit-Queue: Adam Raine <asraine@chromium.org> Reviewed-by: Jack Franklin <jacktfranklin@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Paul Irish <paulirish@chromium.org>
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