* use logger.getChild from `dvc.log` instead of `logging.getLogger`
I got tired adding `# type: ignore[attr-defined]` while using `logger.trace`.
So, now you need to import logger from `from dvc.log import logger` and
create a child logger using `logger.getChild(__name__)`. `logger.getChild`
will return a logger type-hinted as a logger having a `trace` method.
So, from now on, instead of:
```python
import logging
logger = logging.getogger(__name__)
```
you'll have to do following:
```python
from dvc.log import logger
logger = logger.getChild(__name__)
```
* remove all dvc imports from dvc.logger
* use Tqdm back
`dvc commit --help` was also completely broken, which is also fixed.
This adds unit tests for completion generation for both zsh/bash, and
tests that --help works for all commands.
skshetry
Fabian Zills
dberenbaum
Saugat Pachhai (सौगात)