Add log messages in BackEndApp/authv1

## Feature Request

Is your feature request related to an existing [Issue](https://www.github.com/Auto-DL/Generator/issues) or a new implementation?

No

### Feature Description

Use the [configured logger library](https://github.com/Auto-DL/Auto-DL/blob/v1-beta/BackEndApp/BackEndApp/logging.py) to add comprehensive and easy to understand log messages in [BackendApp/authv1/](https://github.com/Auto-DL/Auto-DL/tree/v1-beta/BackEndApp/auth1)

### Possible Solution

```py
import logging
logger = logging.get_logger(__name__)

# add the following wherever necessary
logger.debug("DEBUG MESSAGE")
logger.info("INFO MESSAGE")
logger.warn("WARNING MESSAGE")
logger.error("ERROR MESSAGE")
```