fix: 🐛 Enable constant bitrate seeking for raw ADTS AAC on Android

[lavigarg-simform]

Description

Raw ADTS .aac files have no seek table inside them. On Android, ExoPlayer had no way to find a position, so seeking did nothing — playback stayed stuck at 0 and the duration came back as unknown. iOS was fine.

What changed

• Build the Android player so constant-bitrate seeking is turned on.
• This lets headerless constant-bitrate streams (raw ADTS AAC, and similar MP3/AMR) be seeked by estimating the byte position from the bitrate.
• Seeking and duration now work for raw .aac on Android, matching iOS.

Files that already carry their own seek info (MP3 with a Xing header, MP4/M4A, WAV) are untouched and keep using it.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Closes #429