[minibench] Add RSS stats

[kirklandsign]

Summary

RSS can be used as an indicator for RAM usage. Let's collect it, but it might not be stable right now.

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8982

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 6 New Failures, 1 Unrelated Failure

As of commit 7ac8de0 with merge base 5ac4a3c ():

NEW FAILURES - The following jobs have failed:

• android-perf / benchmark-on-device (ic4, qnn_q8, samsung_galaxy_s22, arn:aws:devicefarm:us-west-2:308535385114:d... / mobile-job (android) (gh)
  Process completed with exit code 22.
• android-perf / benchmark-on-device (ic4, xnnpack_q8, samsung_galaxy_s22, arn:aws:devicefarm:us-west-2:3085353851... / mobile-job (android) (gh)
  Process completed with exit code 22.
• android-perf / build-benchmark-app / linux-job (gh)
  RuntimeError: Command docker exec -t 135ebdc867b941fb0f41c5a8ba0ca4452ac6e603fbb042dec12522752d743baf /exec failed with exit code 1
• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t 287b447b63c3c733233d6e2fae9450836c3f759b5c1ec4590814b259958d11cf /exec failed with exit code 1
• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t e9c5b3c50835dc666f4107d756362559699d73c8f1ae6cf11c401cc841700432 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• android-perf / upload-benchmark-results (gh) (detected as infra flaky with no log or failing log classifier)

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