Add NPU test case

[wangshuai09]

In order to use torchtext with NPU backend, i've run example and unit test cases. All test cases can be work fine but gpu tests are skipped.
This PR adds npu model tests following the #2025, which could help us test the availability of NPU.

Results of unit testing and text_classfication example, verified on NPU,

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/text/2251

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