Feat/rnaa 474 playbacknotification configurable ffrw time

[basiav]

Closes RNAA-474

⚠️ Breaking changes ⚠️

Introduced changes

Introduced changes

• Added optional skipInterval to PlaybackNotificationInfo so apps can configure fast-forward/rewind skip duration in PlaybackNotificationManager.show() (default: 15 seconds).
• iOS: Store skip interval in PlaybackNotification, read it from show() options, and apply it to MPRemoteCommandCenter preferredIntervals for skip forward/backward commands.
• Android: Store skip interval in a shared companion property; use it in MediaSession callbacks (onFastForward / onRewind) and in PlaybackNotificationReceiver (notification action buttons).
• Clamp skipInterval to 1–120 seconds on both platforms.
• Android icons: Use numbered skip icons when interval is 15; use new generic skip drawables for other values.
• Documented the API, behavior, and platform notes in playback-notification-manager.mdx.
• Demo in AudioFile example with skipInterval: 10 for manual testing.

• Linked relevant issue
• Updated relevant documentation
• Added/Conducted relevant tests
• Performed self-review of the code
• Updated Web Audio API coverage
• Added support for web
• Updated old arch android spec file

[basiav]

Applied review suggestions:

• Removed comments
• Removed inline comment from skipInterval in types.ts
• Default (15) and clamp (1–120) are now handled in PlaybackNotificationManager.show() before calling native
• iOS/Android no longer duplicate validation logic — they only store and use the interval from JS
• Docs updated to reflect that clamping happens in JavaScript.