[devtool] make ETDumpGen use bufferdatasink

[Gasoonjia]

Stack from ghstack (oldest at bottom):

• -> [devtool] make ETDumpGen use bufferdatasink #8740

This diff enables customized debug data pipeline by making ETDumpGen leverage user-provided datasink.

Details can be found in https://docs.google.com/document/d/1y_m32mKdj-OgLcLUz9TKhBW3PC3bBDYSBbeAH544EfM/edit?tab=t.0#heading=h.jlkcrurw482r

Differential Revision: D69647096

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8740

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❌ 2 New Failures

As of commit 6cb3188 with merge base bc55c01 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• Lint / lintrunner / linux-job (gh)
  >>> Lint for devtools/etdump/tests/etdump_test.cpp:

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[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
If you are unable to remove the Stale label please contact a maintainer in order to do so.
If you want the bot to never mark this PR stale again, add the no-stale label.
Stale pull requests will automatically be closed after 30 days of inactivity.