feat(browser): Emit web vitals as streamed spans#19827

logaretm wants to merge 3 commits intolms/feat-span-firstgetsentry/sentry-javascript:lms/feat-span-firstfrom

awad/js-17931-webvitals-v2-spansgetsentry/sentry-javascript:awad/js-17931-webvitals-v2-spansCopy head branch name to clipboard