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`type` used in `common_utils` generates test class definition in `common_utils` and
this modifies the module state after it's imported. This is anti-pattern.
This PR get rid of the related utility functions and define test suite manually.

Currently there is no CUDA device for regular FB's infra, where `torchaudio`'s tests are ran.
Skipping these tests consistently raises a flag so we decided to split the tests into runnable and not-runnable on file-level.