Fix torchdata import error

[NicolasHug]

This PR moves all the torchdata imports as lazy imports to avoid import error when torchdata is not present.

Smoke test is passing when torchdata is not present:

(text) ➜  text git:(lajenflajenfljanefljanefljajnef) ✗ python -c "import torchdata"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'torchdata'


(text) ➜  text git:(lajenflajenfljanefljanefljajnef) ✗ python test/smoke_tests/smoke_tests.py
torchtext version is  0.17.0a0+51f373d

[pytorch-bot]

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❌ 9 New Failures, 4 Unrelated Failures

As of commit 7d494b1 with merge base 51f373d ():

NEW FAILURES - The following jobs have failed:

• Bandit / build (gh)
  Process completed with exit code 1.
• CodeQL / build (gh)
  ModuleNotFoundError: No module named 'torch'
• Integration Test / tests (3.8) / linux-job (gh)
  RuntimeError: Command docker exec -t c28a1f6ec6e69c63f20261ea9d85b7026addf50164f693cfa1321875486b26b0 /exec failed with exit code 1
• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
  RuntimeError: Command docker exec -t dbc83b623a5d983e6f406559cb361d17d35e7129afbf3599ffbf2dd176bdcdfe /exec failed with exit code 1
• Unit-tests on Linux CPU / tests (3.9) / linux-job (gh)
  RuntimeError: Command docker exec -t 5160c71294e8281f045afe1e871dd8482a75beadeca1b710c8972ea510b72812 /exec failed with exit code 1
• Unit-tests on Linux GPU / tests (3.8, 11.7) / linux-job (gh)
  RuntimeError: Command docker exec -t f333b6843e3a735133a7b9b85e247c1ee03cdcdf5bad6df12640e45304881de1 /exec failed with exit code 1
• Unit-tests on Windows CPU / tests (3.10) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Unit-tests on Windows CPU / tests (3.8) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Unit-tests on Windows CPU / tests (3.9) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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

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

• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
• Unit-tests on Macos CPU / tests (3.10) / macos-job (gh)
  thinc/backends/numpy_ops.cpp:5948:3: error: no member named 'use_tracing' in '_PyCFrame'
• Unit-tests on Macos CPU / tests (3.8) / macos-job (gh)
  thinc/backends/numpy_ops.cpp:5948:3: error: no member named 'use_tracing' in '_PyCFrame'
• Unit-tests on Macos CPU / tests (3.9) / macos-job (gh)
  thinc/backends/numpy_ops.cpp:5948:3: error: no member named 'use_tracing' in '_PyCFrame'

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