Add support for trace beginning at session start

[MaesterChestnut]

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Latest commit: 32ab88f

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances Crashlytics' error reporting capabilities by deeply integrating OpenTelemetry tracing with user sessions. The changes ensure that all errors and related activities are consistently linked to a session-specific trace, providing a clearer and more comprehensive view of user interactions and potential issues from the moment a session begins. This improves the context available for debugging and understanding the user journey leading up to an error.

Highlights

• Session-level Tracing Integration: Introduced a custom SessionContextManager and SessionSpanProcessor to ensure that a dedicated trace is started at the beginning of each Crashlytics session. This session trace is automatically associated with all subsequent spans if no other active trace is present, and session IDs are automatically added to all spans.
• Enhanced Error Reporting: Modified the recordError function to leverage the active session trace. If an error occurs and no other trace is active, it will now be logged within the context of the session's trace, providing better correlation for error analysis.
• Session Lifecycle Management: Implemented logic to explicitly start a 'session-start' span when a new Crashlytics session is initiated and to properly end this span when the page becomes hidden or is unloaded, ensuring complete session trace lifecycles.
• Dependency Updates and Refactoring: Updated OpenTelemetry dependencies, including the addition of @opentelemetry/context-zone and removal of @opentelemetry/instrumentation-user-interaction. The getSessionId logic was refactored into its own module for better organization.

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