fix(replay): avoid throttling and locking on main thread

[ioannisj]

💡 Motivation and Context

Helps with #321

Avoid main thread when touching session on user interactions on PostHogSessionManager on throttling from ViewLayoutPublishing

Profiling these changes on device I see the following, so I think this will help.

Before

After

💚 How did you test it?

📝 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.