Move caffe2/serialize to torch/csrc/api

[cyyever]

Move caffe2/serialize to torch/csrc/api since it is used solely in jit code. The getRecordMultiReaders is removed since it has race conditions and is not used currently

cc @albanD

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit b898b5f with merge base 10c7f03 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• periodic / linux-focal-cuda11.8-py3.10-gcc9-debug / test (default, 3, 5, linux.4xlarge.nvidia.gpu) (gh) (similar failure)
  functorch/test_ops.py::TestOperatorsCUDA::test_vjp_linalg_tensorsolve_cuda_float32
• periodic / win-vs2019-cuda11.8-py3 / test (default, 3, 4, windows.g5.4xlarge.nvidia.gpu) (gh) (similar failure)
  functorch\test_ops.py::TestOperatorsCUDA::test_vjp_linalg_tensorsolve_cuda_float32

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[cyyever]

@pytorchbot rebase -b main

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/main. Check the current status here

[pytorchmergebot]

Successfully rebased caffe2_onnx31 onto refs/remotes/origin/main, please pull locally before adding more changes (for example, via git checkout caffe2_onnx31 && git pull --rebase)

[cyyever]

@r-barnes Help review?