[export] Add schema version to serializer/deserializer

[angelayi]

Added a version number to the schema for BC issues. We will add this number to the serialized ExportedProgram and then when deserializing, if the number does not match up with the existing deserializer, we will error. We should update the number of there are any major changes to the schema.

[pytorch-bot]

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[angelayi]

@pytorchbot merge

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[pytorchmergebot]

Merge failed

Reason: 1 jobs have failed, first few of them are: trunk / win-vs2019-cpu-py3 / test (default, 3, 3, windows.4xlarge.nonephemeral)

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[angelayi]

@pytorchbot merge

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Merge started

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[ZainRizvi]

@pytorchbot revert -m "Sorry, but this is breaking internal tests. Please see D48549362 for more details" -c ghfirst

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[pytorchmergebot]

Reverting PR 107420 failed

Reason: Command git -C /home/runner/work/pytorch/pytorch revert --no-edit 63e9b5481d0d7e8d1f4e2fa85a010ce054751001 returned non-zero exit code 1

Auto-merging test/export/test_serialize.py
Auto-merging torch/_export/serde/schema.py
CONFLICT (content): Merge conflict in torch/_export/serde/schema.py
Auto-merging torch/_export/serde/serialize.py
error: could not revert 63e9b5481d0... [export] Add schema version to serializer/deserializer (#107420)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git revert --continue".
hint: You can instead skip this commit with "git revert --skip".
hint: To abort and get back to the state before "git revert",
hint: run "git revert --abort".

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Raised by workflow job