Make TorchElastic timer importable on Windows

[malfet]

Also, add torch.distributed to test imports, so that we would not
regress in the future

Fixes #85427

[pytorch-bot]

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[d4l3k]

Looks like from torch.distributed.rpc is problematic on windows

======================================================================
ERROR [0.039s]: test_circular_dependencies (__main__.TestImports)
Checks that all modules inside torch can be imported
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\actions-runner\_work\pytorch\pytorch\test\test_testing.py", line 1809, in test_circular_dependencies
    mod = importlib.import_module(mod_name)
  File "C:\Jenkins\Miniconda3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "C:\actions-runner\_work\pytorch\pytorch\build\win_tmp\build\torch\distributed\optim\optimizer.py", line 9, in <module>
    from torch.distributed.rpc import RRef
ImportError: cannot import name 'RRef' from 'torch.distributed.rpc' (C:\actions-runner\_work\pytorch\pytorch\build\win_tmp\build\torch\distributed\rpc\__init__.py)

LGTM from the elastic side though

[malfet]

@pytorchbot merge -f "Win tests are green"

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[malfet]

Looks like from torch.distributed.rpc is problematic on windows

@d4l3k yeah, had to exclude a bunch of subpackages in torch.distribtued. as RPC is not compiled for Windows for some reason, see:

pytorch/caffe2/CMakeLists.txt

Lines 619 to 624 in f98edfc

	if(USE_DISTRIBUTED)
	append_filelist("libtorch_distributed_base_sources" TORCH_SRCS)
	if(NOT WIN32)
	append_filelist("libtorch_distributed_extra_sources" TORCH_SRCS)
	endif()
	endif()