Use F::*FuncOptions for embedding/embeddingbag functionals (#29673)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29673
Following https://github.com/pytorch/pytorch/pull/29364 and https://github.com/pytorch/pytorch/pull/29404, this PR makes `F::EmbeddingFuncOptions` and `F::EmbeddingBagFuncOptions` separate classes from `torch::nn::EmbeddingOptions` and `torch::nn::EmbeddingBagOptions`, so that it's easier to enforce that arguments such as `num_embeddings` and `embedding_dim` are required for `torch::nn::EmbeddingOptions` and `torch::nn::EmbeddingBagOptions`.
Test Plan: Imported from OSS
Differential Revision: D18462540
Pulled By: yf225
fbshipit-source-id: f2abf431e48675b0a9d7f6f398cdb90ff9037c35
