[Feature request] Add /kaggle/input to module search path

Currently, `sys.path` shows the following folders in the module search path

```
['/kaggle/working',
'/kaggle/lib/kagglegym',
'/kaggle/lib',
'/opt/conda/lib/python310.zip',
'/opt/conda/lib/python3.10',
'/opt/conda/lib/python3.10/lib-dynload',
'',
'/root/.local/lib/python3.10/site-packages',
'/opt/conda/lib/python3.10/site-packages',
'/root/src/BigQuery_Helper']
```

Is it possible to also add `/kaggle/input` to this list? In this case modules from external datasets/notebooks could be loaded without a need to adjust the path.

P.S. Not sure if this is a proper repo to open this issue, or I need to open it in `docker-python`.

Start by locating the environment setup that determines Python's sys.path; the issue does not name a file or entry point, and it questions whether docker-python is the correct repository. Reproduce the listed path and verify that /kaggle/input is included and modules from external datasets or notebooks import without manual path adjustment.

Written by the indexing model from the issue text.