fix(android): enable offline video playback with local files

[maurovitale]

About the changes

This PR fixes offline video playback support on Android by updating the upstream data source factory in ExoPlayerController.
Problem: The player was previously using DefaultHttpDataSource.Factory(), which only supports HTTP/HTTPS URLs. This prevented playback of locally cached or downloaded videos using file:// URLs, breaking offline functionality.
Solution: Replace DefaultHttpDataSource.Factory() with DefaultDataSource.Factory(context) which supports multiple protocols including:
HTTP/HTTPS URLs (existing functionality)
Local file:// URLs (new offline support)
Content:// URLs
Asset:// URLs
This change enables the player to handle both online streaming and offline cached/downloaded content seamlessly.

Important files

android/src/main/kotlin/media/bcc/bccm_player/players/exoplayer/ExoPlayerController.kt - Updated upstream data source factory to support local files

Discussion points

This is a critical fix for applications that require offline video playback capabilities. The change is backward compatible and doesn't affect existing HTTP streaming functionality while adding support for local file playback.
Testing: Verify that both HTTP streaming and local file:// playback work correctly after this change.

[andreasgangso]

Thank you for this!

It looks good to me @sifferhans. Here's the source code for DefaultDataSource: https://github.com/androidx/media/blob/release/libraries/datasource/src/main/java/androidx/media3/datasource/DefaultDataSource.java

maybe just verify that offline urls aren't affected since that's the only special data source for bcc media