remove daemon threads

[divyanshk]

This PR adds

• builds on top of previous shutdown PRs (Explicit iterator shutdown #1482, add explicit shutdown calls #1477)
• adds in explicit shutdowns in single-threaded-mapper
• removes daemonic reading arg

Tested this in meta CI + Github Ci - no hanging unit tests. Will test with production job as well.

[pytorch-bot]

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 5ddf4d3 with merge base 10b87d6 ():

NEW FAILURES - The following jobs have failed:

• Build Linux Wheels / pytorch/data / build-manywheel-py3_9-cpu (gh)
• Build Linux Wheels / pytorch/data / upload / upload-manywheel-py3_9-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_data__3.9_cpu_x86_64

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run StatefulDataLoader Tests / test (macos-latest, 3.12) (gh) (trunk failure)

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