move torchrec dlrm example into facebookresearch/dlrm (#221)
Summary:
X-link: https://github.com/pytorch/torchrec/pull/221
move torchrec's dlrm implementation from torchrec/examples to facebookresearch/dlrm/torchrec_dlrm
https://github.com/facebookresearch/dlrm/pull/232 - manual pull
Reviewed By: s4ayub
Differential Revision: D35625004
fbshipit-source-id: 2dc46cd5ae8581728a15c8023cb13228b95995b0
