Cannot import name 'hydra_main' from 'dora' on Colab or Kaggle environment

## 🐛 Bug Report

I wanted to run training inside colab notebook using code that utilizes `dora`. But after installation `hydra_main` seems to be missing.

```from dora import hydra_main``` gives me following exception

```ImportError Traceback (most recent call last)
[](https://localhost:8080/#) in ()
----> 1 from dora import hydra_main

ImportError: cannot import name 'hydra_main' from 'dora' (/usr/local/lib/python3.9/dist-packages/dora/__init__.py)
```

I installed it with
```pip install -U dora-search```

and tried few different versions.

## Your Environment
Both kaggle or colab notebooks.

Or maybe this is expected and one can't use `dora` inside colab?

Reproduce the import in a Colab or Kaggle notebook after installing dora-search, then inspect the installed dora/__init__.py and compare the available package versions. Done means the expected behavior for `from dora import hydra_main` in notebook environments is established and the reported ImportError is either resolved or clearly documented.

Written by the indexing model from the issue text.