Add player state persistence concept

app/src/main/kotlin/it/vfsfitvnm/vimusic/models/QueuedMediaItem.kt

@@ -0,0 +1,13 @@
+package it.vfsfitvnm.vimusic.models
+
+import androidx.media3.common.MediaItem
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity
+class QueuedMediaItem(
+    @PrimaryKey(autoGenerate = true) val id: Long = 0,
+    @ColumnInfo(typeAffinity = ColumnInfo.BLOB) val mediaItem: MediaItem,
+    var position: Long?
+)