Deprecate torchtext dependent models and related code. (#1831)
Summary:
torchtext is on a much lessen supported model, so we are deprecating the workload and make torchbench not depend on torchtext.
Fixes https://github.com/pytorch/benchmark/issues/1830
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1831
Reviewed By: abhinavarora
Differential Revision: D48415274
Pulled By: xuzhao9
fbshipit-source-id: 9bb90ec3d84d2260b20cab1051d14c3d0a3129a0