[chain-pr 9/12] Migrate RUM core to async SessionManager and unified domain types

[johnHackworth]

This PR is part of a chain split from #0 v7 by chain-pr.

Changes

Replace rumSessionManager with shared SessionManager. Rework preStartRum/startRum/rumPublicApi to await the session manager. Add SessionType and computeSessionReplayState. Replace startDurationVital/stopDurationVital reference-based API with vitalKey, route requests through bufferedDataObservable, use trackeventDocument trace id, simplify resource collection (matchRequestResourceEntry removed, retrieveInitialDocumentResourceTiming inlined), drop FID tracking, drop several deprecated config options, default privacy to MASK_USER_INPUT and enablePrivacyForActionName to true, remove betaTrackActionsInShadowDom, remove trackBfcacheViews, add SESSION_RENEWAL view loading type with renew_event, drop isSampled child fallback, etc.

---

Draft — pending author review. Merge in order unless marked parallel.

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

chain-pr[bot] seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}