Make ImagenImage not subclass ImagenImageRepresentible

Author: David Motsonashvili

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/ImagenImage.kt

@@ -1,12 +1,7 @@
 package com.google.firebase.vertexai.type
 
 public class ImagenImage(
-  public val data: ByteArray?,
-  public val gcsUri: String?,
-  public val mimeType: String,
-) : ImagenImageRepresentible {
-
-  override fun asImagenImage(): ImagenImage {
-    return this
-  }
-}
+  internal val data: ByteArray?,
+  internal val gcsUri: String?,
+  internal val mimeType: String,
+) {}