Remove deprecation of CUTC decoder

[samanklesaria]

We deprecated the CUTC decoder for the 2.8 release as we thought we might need to remove all C++ extensions from the package. However, realizing now that this does not need to be the case, we should un-deprecate the functionality.

[pytorch-bot]

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[NicolasHug]

thanks, let's merge it at the end once we finished the migrations

[samanklesaria]

What other deprecation logic needs to be removed? A git grep (after merging the current PRs in the queue - see psuedo_main for what this looks like) gives no results.

[samanklesaria]

I actually believe this PR needs to be merged in next, due to a change in how sphinx is working nowadays. In all other PRs now, we are getting an error like this when building documentation locally:

Traceback (most recent call last):
  File "/home/samanklesaria/world/.pixi/envs/default/lib/python3.12/site-packages/sphinx/util/inspect.py", line 461, in safe_getattr
    return getattr(obj, name, *defargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/samanklesaria/world/.pixi/envs/default/lib/python3.12/site-packages/torchaudio/models/decoder/__init__.py", line 42, in __getattr__
    item = dropping_support(orig_item)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/samanklesaria/world/.pixi/envs/default/lib/python3.12/site-packages/torchaudio/_internal/module_utils.py", line 84, in decorator
    wrapped = wrap_deprecated(func, f"{func.__module__}.{func.__name__}", direction, version=version, remove=remove)
TypeError: __type_params__ must be set to a tuple

This suggests that if we just merged this PR first, which eliminating the CUTC warnings, this error would go away. Note that this error does not show up in the CI: the CI logs for sphinx only show the exit code and suppress all other output.

[pearu]

This PR requires:

• resolve conflicts
• be merged before Remove dropping_support decorators. #4056 or the changes here need to moved to Remove dropping_support decorators. #4056

[samanklesaria]

I'm not actually sure this should be added to the 2.9 milestone. I believe Nicholas only wanted to remove the deprecations once the stable ABI ports are complete. I'll resolve the new conflicts, but I think this PR should be set aside for now.