Add shuffle parameter to playback intent (#1813)

## Description
Adds an optional boolean parameter `shuffle` that is read for the
playback intent. When true, it will cause the resulting media to be
shuffled if applicable.

Something can be shuffled if the `itemId` is a grouping on media such as
a playlist, series, season, or even library.

### Related issues
Depends on #1756

### Testing
Emulator with the documented command

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/services/IntentService.kt

@@ -103,11 +103,13 @@ class IntentService
 
                     "com.github.damontecres.wholphin.PLAYBACK", "play" -> {
                         val position = intent.getLongParam("position")?.coerceAtLeast(0)
+                        val shuffle = intent.getBooleanExtra("shuffle", false)
 
                         val playbackDestination =
                             Destination.Playback(
                                 itemId = itemId,
                                 positionMs = position ?: 0L,
+                                shuffle = shuffle,
                             )
 
                         if (itemDestination is Destination.Playback) {