[quant] Support lowering for quantized embedding byte operator (#91159)
Summary: This PR adds lowering for embedding in quantization in executorch flow
Test Plan: buck run executorch/exir/tests:quant_fusion_pass -- "executorch.exir.tests.test_quant_fusion_pass.TestQuantFusionPass.test_embedding_byte"
Reviewed By: qihqi
Differential Revision: D41673139
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91159
Approved by: https://github.com/vkuzo
