GTFS: Add file storage for gtfs static data downloads

[ksharma-xyz]

TL;DR

Added GTFS static file download functionality for Sydney Trains data with platform-specific file storage implementations.

What changed?

• Created a FileStorage interface with platform-specific implementations for Android and iOS
• Implemented GTFS file downloading functionality in RealNswGtfsService
• Added dependency injection modules for GTFS and file storage services
• Integrated GTFS service into SavedTripsViewModel for initial testing
• Removed BuildKonfig plugin and related API key configuration as it was duplicate

How to test?

1. Launch the app and navigate to the Saved Trips screen
2. The app should attempt to download Sydney Trains GTFS data
3. Verify that a "sydneytrains.zip" file is created in the app's files directory
4. Check logs for "Downloading file" and "File downloaded" messages

Why make this change?

To enable offline access to transit schedule data by implementing the infrastructure needed to download and store GTFS static files locally on both Android and iOS platforms. This is a foundational step towards providing reliable trip planning functionality without constant network connectivity.

[ksharma-xyz]

• GTFS: Add file storage for gtfs static data downloads #449 👈 (View in Graphite)
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[ksharma-xyz]

Merge activity

• Dec 11, 5:33 AM EST: A user merged this pull request with Graphite.