feat(android): add audio track selection for ExoPlayer

[nateshmbhat]

• Implemented getAudioTracks() and selectAudioTrack() methods for Android video player

Android PR for : #9925

Pre-Review Checklist

• [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• [x] I read the [Tree Hygiene] page, which explains my responsibilities.
• [x] I read and followed the [relevant style guides] and ran [the auto-formatter].
• [x] I signed the [CLA].
• [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• [x] I [linked to at least one issue that this PR fixes] in the description above.
• [x] I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy], or I have commented below to indicate which [version change exemption] this PR falls under[^1].
• [x] I updated CHANGELOG.md to add a description of the change, [following repository CHANGELOG style], or I have commented below to indicate which [CHANGELOG exemption] this PR falls under[^1].
• [x] I updated/added any relevant documentation (doc comments with ///).
• [x] I added new tests to check the change I am making, or I have commented below to indicate which [test exemption] this PR falls under[^1].
• [x] All existing and new tests are passing.

[nateshmbhat]

as we don't wanna do breaking changes to the platform interface @ash2moon have moved the trackindex/groupindex handling logic parsing/encoding logic to the dart side. Please check pr

[nateshmbhat]

@camsim99 can you please review this PR ?

[camsim99]

as we don't wanna do breaking changes to the platform interface @ash2moon have moved the trackindex/groupindex handling logic parsing/encoding logic to the dart side. Please check pr

Also to follow up on this: Is there a reason we don't just send the track index and group index over separately versus as a group_track concatenated String format as ash2moon mentioned?

[nateshmbhat]

as we don't wanna do breaking changes to the platform interface @ash2moon have moved the trackindex/groupindex handling logic parsing/encoding logic to the dart side. Please check pr

Also to follow up on this: Is there a reason we don't just send the track index and group index over separately versus as a group_track concatenated String format as ash2moon mentioned?

initially the idea was to have a single track id which makes it more easy to manage for the developer using the library. also on ios there's no group index. so it was done in that way.

[nateshmbhat]

@camsim99 just checking in 😄 Did you get a chance to review the changes ?

[nateshmbhat]

@camsim99 here's the thread regarding handling of track change completion : https://github.com/flutter/packages/pull/9925#discussion_r2466556034

Updated the PR as per your review comments.

[nateshmbhat]

Done! I've:

1. ✅ Ran the Dart formatter
2. ✅ Bumped the version in pubspec.yaml to 2.9.0

Regarding the lint baseline - the updateLintBaseline task ran successfully but reported "No baseline file is specified". The current build.gradle uses the deprecated lintOptions block without a baseline file configured. have added a baseline = file("lint-baseline.xml") to the lint configuration first.

@camsim99 can you please check ?

[nateshmbhat]

@camsim99 done ✅

All Checks are Passing now ✅ 🏁 ✅