Setting log level higher than warning does not suppress progress bar
Hi,

you can suppress progress bars by patching logging as follows:
```python
import datasets
import logging
datasets.logging.get_verbosity = lambda: logging.NOTSET
# map call ...
``` Thank you, it worked :) See https://github.com/huggingface/datasets/issues/2528 for reference Note also that you can disable the progress bar with

```python
from datasets.utils import disable_progress_bar
disable_progress_bar()
```

See https://github.com/huggingface/datasets/blob/8814b393984c1c2e1800ba370de2a9f7c8644908/src/datasets/utils/tqdm_utils.py#L84 Now the library officially recommends `set_progress_bar_enabled(False)`

```py
from datasets.utils import set_progress_bar_enabled

set_progress_bar_enabled(False)
```

source:

https://github.com/huggingface/datasets/blob/1fd47120ace13626c528367787ffa13e1a26e6c0/src/datasets/utils/tqdm_utils.py#L83-L88


## Describe the bug
I would like to disable progress bars for `.map` method (and other methods like `.filter` and `load_dataset` as well).
According to #1627 one can suppress it by setting log level higher than `warning`, however doing so doesn't suppress it with version 1.9.0.

I also tried to set `DATASETS_VERBOSITY` environment variable to `error` or `critical` but it also didn't work.

## Steps to reproduce the bug
```python
import datasets

from datasets.utils.logging import set_verbosity_error

set_verbosity_error()

def dummy_map(batch):
    return batch

common_voice_train = datasets.load_dataset("common_voice", "de", split="train")
common_voice_test = datasets.load_dataset("common_voice", "de", split="test")

common_voice_train.map(dummy_map)
```

## Expected results
- The progress bar for `.map` call won't be shown

## Actual results
- The progress bar for `.map` is still shown 

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.9.0
- Platform: Linux-5.4.0-1045-aws-x86_64-with-Ubuntu-18.04-bionic
- Python version: 3.7.5
- PyArrow version: 4.0.1
