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Pants

How can I handle optional dependencies for Python requirements in pants? Specifically for the snowflake Python connector, which has an optional dependency on pandas I want to be able to turn on and off.

I'm not sure if there's a better way, but we've declared a `python_requirement` ourselves, like:

```python_requirement(name="foo_with_stuff", requirements="foo[stuff]")```
So, when you want to depend on that, you just add `foo_with_stuff` to the list of deps.

If you just put both in a `requirements.txt` file, it ignores the optional stuff and just generates one.

What circumstances do you want to be able turn it off and on in? For different imports of it?