add optimizer key in EmbeddingFusedOptimizer and KeyValueEmbeddingFusedOptimizer. #2461
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Summary:
Add field optimizer_key in Torchrec EmbeddingFusedOptimizer. During the initialization of embedding module BatchedFusedEmbeddingBag, pass the optimizer_key information from fused parameters when creating the EmbeddingFusedOptimizer.
In sparse arch, update the optimizer key for TBE when creating a combined optimizer for different TBE modules. The optimizer_key in the combined fused optimizer can be extracted for learning rate warm up processing.
Differential Revision: D61668809