**Changes**
Add tests in `test_frontend_tflite.py`.
Lower S`PACE_TO_BATCH_ND` / `BATCH_TO_SPACE_ND` through TOPI in
`tflite_frontend.py`.
Use tf.raw_ops.BatchToSpaceND in the test because tf.batch_to_space_nd
is not available in this TF build.
**Why the TFLite frontend changed**
The frontend was calling relax.op.nn.space_to_batch_nd /
relax.op.nn.batch_to_space_nd, which aren’t implemented in this
checkout. I updated the TFLite frontend to lower these ops via TOPI
packed calls so conversion works and the new tests can pass.
**Test:**
```
pytest test_frontend_tflite.py -k "test_space_to_batch_nd or test_batch_to_space_nd"
```
related to #18971
Bana
87bf3022b7