SerializedShuffleHandle — Marker Interface for Serialized Shuffle Handles

SerializedShuffleHandle is a BaseShuffleHandle with no additional methods or fields and serves only to identify the choice of a serialized shuffle.

Like BaseShuffleHandle, SerializedShuffleHandle takes shuffleId, numMaps, and a ShuffleDependency.

SerializedShuffleHandle is created when SortShuffleManager is requested for a ShuffleHandle (for a ShuffleDependency) and the conditions hold (but for BypassMergeSortShuffleHandle do not which are checked first).

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