Add training common files for fbgemm inference mode

[banitag1]

Summary: We need to reduce the binary size for sigrid_gpu and inference mode in fbgemm needed some more dependencies, so we created a training-common which can be included in the inference.

Reviewed By: sryap, hieule22

Differential Revision: D54315931

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This pull request was exported from Phabricator. Differential Revision: D54315931

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This pull request was exported from Phabricator. Differential Revision: D54315931