[quant][pyper] Add support for pruned weights in embedding_bag_byte lookup (#47329)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47329
Supports pruned weights along with mapping for the compressed indices
Test Plan:
python test/test_quantization.py TestQuantizedEmbeddingOps
Imported from OSS
Reviewed By: qizzzh
Differential Revision: D24719909
fbshipit-source-id: f998f4039e84bbe1886e492a3bff6aa5f56b6b0f
