Backtrace data models serialization optimization

[BartoszLitwiniuk]

Summary

This PR introduces a comprehensive refactor of the Backtrace data models in the Android SDK. The key objectives are to enhance code maintainability, improve serialization/deserialization processes, and ensure robust unit testing.

Key Changes

• Refactored existing data models for clarity and performance.
• Improved serialization and deserialization mechanisms.
• Added new unit tests to increase code coverage.
• Android context is now extracted from BacktraceData class and passed only once on initialization.
• BacktraceData should be initialized using builder class
• Removed deprecated and unused code.
• Enhanced documentation and code comments for better readability.
• Added final keyword in multiple places to emphasize immutability, for safety and to improve performance
• BacktraceResult has been split into two classes, BacktraceApiResult which parsing REST API response and BacktraceResult is wrapper for BacktraceApiResult with additional informations like instance of report which was sent. Processing of field response is now improved and correctly processed inside API.
• Minor improvements in unit tests

Impact

This change affect all models which we are serializing and deserializing. This refactor aims to optimize performance and reliability while simplifying future development and debugging processes.

Ref: BT-2922

[perf2711]

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