fetchMediaComposition  
  Fetches a MediaComposition located at the provided uri.
val mediaCompositionResult = mediaCompositionService.fetchMediaComposition(uri)
val mediaComposition = mediaCompositionResult.getOrNull()
if (mediaComposition == null) {
    val throwable = mediaCompositionResult.exceptionOrNull()
    // Handle error
} else {
    // Do something with the media composition
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Return
A Result containing either the successfully fetched MediaComposition or an error indicating the reason for failure.
Parameters
uri
The URI identifying the desired MediaComposition.