docs: Update react-native download API and event listeners

[syed-tp]

• Add documentation for the new startDownload method.
• Document new event listeners: onDownloadStarted, onDownloadPaused, onDownloadResumed, onDownloadCompleted, onDownloadFailed, and onDownloadDeleted.
• Add deprecation notice for onDownloadStateChanged.
• Add a comprehensive React Native usage example.

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the documentation for the React Native TPStreams SDK's download functionality. It introduces a new method for initiating downloads and provides a more robust event-driven system for tracking download progress and state changes. The update aims to improve developer experience by offering clearer guidance and more precise control over offline video management, alongside a practical usage example.

Highlights

• New Download Initiation Method: Documentation for the new startDownload method has been added, detailing its parameters and usage for initiating video downloads.
• Enhanced Event Listeners: New dedicated event listeners such as onDownloadStarted, onDownloadPaused, onDownloadResumed, onDownloadCompleted, onDownloadFailed, and onDownloadDeleted are now documented, offering more granular control over download state changes.
• Deprecation Notice: The onDownloadStateChanged event listener has been marked as deprecated, with a recommendation to use the new specific event listeners for better precision and type safety.
• Comprehensive Usage Example: A detailed React Native usage example has been included to demonstrate how to initialize the progress listener and subscribe to the new download events.

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Changelog

• docs/mobile-sdk/react-native-sdk/downloads.md
  • Added documentation for the new startDownload API, including its parameters and usage.
  • Introduced and documented new specific download event listeners: onDownloadStarted, onDownloadPaused, onDownloadResumed, onDownloadCompleted, onDownloadFailed, and onDownloadDeleted.
  • Added a deprecation notice for the onDownloadStateChanged event, recommending the use of new dedicated events.
  • Updated the structure of the documentation to better categorize download initiation, management, and events.
  • Included a comprehensive React Native code example demonstrating the initialization of progress listeners and subscription to new download events.
  • Refined the descriptions for DownloadItem and DownloadError data structures.

Activity

• No human activity has been recorded on this pull request yet.

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Code Review

This pull request significantly improves the documentation for the React Native SDK's download functionality. It introduces the new startDownload method, documents new event listeners, adds a deprecation notice for onDownloadStateChanged, and provides a comprehensive usage example. The new structure is much clearer and more helpful for developers. I've found one issue in the new usage example regarding resource cleanup which should be addressed to ensure users write robust code.

_{Note: Security Review has been skipped due to the limited scope of the PR.}