gpu version `int_nbit_split_embedding_codegen_lookup_function` not support `indices` and `offsets` with uint64 dtype

[tiankongdeguiji]

This PR removes uint32 indices protection in quant/embedding_modules.py. Nevertheless, when indices and offsets inputs of uint64 dtype are provided, int_nbit_split_embedding_codegen_lookup_function triggers a RuntimeError: expected scalar type Int but found Long on the GPU. Would it be possible to add support for the uint64 dtype on GPU devices?

[PaulZhang12]

It what cases would it be necessary to use uint64?

[tiankongdeguiji]

It what cases would it be necessary to use uint64?

In certain scenarios, the uint32 data type is insufficient to contain the indices for user_id and several combo feature.

[spcyppt]

@tiankongdeguiji Hi, let me bring this to the FBGEMM team's attention and get back to you.