Tutorial on Analytics Lifecycle sessions

### Is there an existing issue for this?

- [X] I have searched the existing issues

### What feature should be added?

Write a tutorial on how Lifecycle sessions are computed for Analytics. Define how start&pause API calls are used internally by the SDK, and how lifecycle.sessionTimeout is being used to determine the session duration.

Include developer tips on how to debug Lifecycle with verbose logs and/or Assurance.

### What is the expected behavior?

Include example diagrams with valid Lifecycle sessions, and invalid Lifecycle session (e.g. incorrect start/pause calls).

### How will this feature improve the user experience?

By providing more examples.

### What would a solution for this issue look like?

_No response_

Start by reviewing the existing Analytics Lifecycle and Assurance documentation, then trace how the SDK’s start and pause calls and lifecycle.sessionTimeout are described. Done means a tutorial includes valid and invalid session diagrams plus practical verbose-log or Assurance debugging tips.

Written by the indexing model from the issue text.