Make all client integrations (frontend, flutter, android..) use otel as their main protocol + split session replays away from otel

[dusanstanojeviccs]

Session replay should go as a blob

[dusanstanojeviccs]

https://www.reddit.com/r/Observability/comments/1t3ivg3/how_to_properly_add_session_replays_to_the/

[dusanstanojeviccs]

The plan so far:

1 - add optional param to js-client and the traceway-flutter repositories so that session replays are transmitted without the additional data (logs/metrics/traces)

2- do the integration docs with the standard otel libraries to attach session_id as the attribute on the top level span

3 - write a doc on how to setup this easily