chore: more session replay metadata

[marandaneto]

:bulb: Motivation and Context

Ideas for https://posthog.slack.com/archives/C043VJ93L3B/p1725259136850079

:green_heart: How did you test it?

:pencil: Checklist

• [ ] I reviewed the submitted code.
• [ ] I added tests to verify the changes.
• [ ] I updated the docs if needed.
• [ ] No breaking change or entry added to the changelog.

[github-actions[bot]]

	Fails
:no_entry_sign:	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Next" section. Make sure the entry includes this PR's number. Example:

## Next
- more session replay metadata ([#176](https://github.com/PostHog/posthog-android/pull/176))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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[marandaneto]

we are optimizing the screenshot snapshots with better encoding and some other things, closing this for now. we already send $lib, so also do not need to do anything else.