[BE] Migrate dtype_abbrs into one location (#152229)

Namely `torch.utils._dtype_abbrs.dtype_abbrs`

Before that it was defined in various forms of completeness in
c02edba863/torch/fx/graph.py (L215),
c02edba863/torch/testing/_internal/common_utils.py (L5226)
 and c02edba863/torch/testing/_internal/logging_tensor.py (L17)

TODO:
 - Add linter that `torch.testing._internal` module is not referenced from any of the public facing APIs, as it can have extra dependencies such as `expect_test`

Fixes https://github.com/pytorch/pytorch/issues/152225

Pull Request resolved: https://github.com/pytorch/pytorch/pull/152229
Approved by: https://github.com/clee2000, https://github.com/Skylion007

test/test_meta.py

@@ -7,6 +7,7 @@ import os
 import numpy as np
 from enum import Enum
 from torch.overrides import resolve_name
+from torch.utils._dtype_abbrs import dtype_abbrs
 from torch.utils._pytree import tree_map, tree_map_only, tree_flatten, tree_unflatten
 from torch.utils import _pytree as pytree
 from torch._subclasses.meta_utils import MetaConverter, assert_metadata_eq, is_sparse_any
@@ -22,7 +23,6 @@ from torch.testing._internal.common_utils import (
     suppress_warnings,
     TEST_WITH_TORCHDYNAMO,
     run_tests,
-    dtype_abbrs,
     parametrize,
     xfailIfTorchDynamo,
 )