Create 0110-client-user-session.md
Feature RFC to define and decide on a user session concept for Sentry SDKs. This is focused on client side SDKs, and aims to solve the ability for SDKs to uniquely link all events associated with a unique user sessions. Which would allow to create a link between all events generated by the SDK during the session, to group them in the Sentry UI, and allow the ID to be considered during client and server side sampling to ensure the completeness of user session in sentry.
Can we actually somehow reuse the release health feature for that? each session already has an ID, that ID should be set in the event, and maybe propagate this ID as well similarly to connected errors and distributed tracing. Would that be a viable option?