Python Simple Function Support

# What
Add the adapter code that automitically creates a UDF from a simple Python function like:

```python
def add_one(x: int) -> int:
    return x + 1
```

# Why
Users should have a good UX.

# How
- [x] write up type system mapping
- [x] think about Arrow nulls and how they map to Python optionals a la `int | None`
- [x] write simple driver that calls the Python function in a loop