Parquet: add `on_bad_file` argument to error/warn/skip bad files
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```python
from datasets import load_dataset

on_bad_file = "error"  # default
# on_bad_file = "warn"  # warn and skip bad file
# on_bad_file = "skip"  # skip bad file
ds = load_dataset(parquet_dataset_id, on_bad_file=on_bad_file)
```