Add util function in etdump to get debug buffer size

[YIWENX14]

Summary: Add util function get_debug_buffer_size in ETDumpGen to get debug buffer size in backend execution.

Differential Revision: D66855639

[pytorch-bot]

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❌ 2 New Failures

As of commit b163118 with merge base 3be3b92 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / unittest-arm / linux-job (gh)
  RuntimeError: Command docker exec -t 214c81c6edd84de78eb8e9ce4270704e003a09f727fe5bf9197e8e72d7a4d901 /exec failed with exit code 1

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66855639

[github-actions]

This PR needs a release notes: label

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[Olivia-liu]

lgtm

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66855639