Make minio pip-installable as an extra

**Describe the bug**

`testcontainers.minio` must be installed via the command `pip install testcontainers-minio`. I'd expect this to be pip installable as an extra: `pip install testcontainers[minio]`

**To Reproduce**

```
pip install testcontainers[minio]

WARNING: testcontainers 3.7.1 does not provide the extra 'minio'
```