Add basic music video support (#948)

## Description
Just enables showing and playing music videos as if they were regular
videos. Basic metadata is shown as well.

Navigation isn't great because a music video library goes by folders
which don't necessary have the best UI choices.

### Related issues
Related to #267 

### Testing
Checked playback on the emulator

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/ui/nav/DestinationContent.kt

@@ -121,7 +121,9 @@ fun DestinationContent(
                     )
                 }
 
-                BaseItemKind.VIDEO -> {
+                BaseItemKind.VIDEO,
+                BaseItemKind.MUSIC_VIDEO,
+                -> {
                     // TODO Use VideoDetails
                     MovieDetails(
                         preferences,

app/src/main/java/com/github/damontecres/wholphin/util/Constants.kt

@@ -9,6 +9,7 @@ val supportItemKinds =
         BaseItemKind.EPISODE,
         BaseItemKind.SERIES,
         BaseItemKind.VIDEO,
+        BaseItemKind.MUSIC_VIDEO,
         BaseItemKind.SEASON,
         BaseItemKind.COLLECTION_FOLDER,
         BaseItemKind.FOLDER,
@@ -47,6 +48,7 @@ val supportedPlayableTypes =
         BaseItemKind.MOVIE,
         BaseItemKind.EPISODE,
         BaseItemKind.VIDEO,
+        BaseItemKind.MUSIC_VIDEO,
         BaseItemKind.TV_CHANNEL,
         BaseItemKind.TV_PROGRAM,
         BaseItemKind.RECORDING,