feature: Range builtin

The `range` built-in can offer a comfortable way to generate facts.
It should process 3 arguments `min, max, step_size`
For example:
```
A(range(1, 5, 0.5)).
B(range(1, 5, 0.5), range(1, 5, 1)).
```

Start by locating how built-in functions are registered, evaluated, and tested in the repository. Trace the existing built-ins to determine the expected handling of three arguments, then use the issue's range examples as the acceptance cases. Done means range accepts min, max, and step_size and produces the values needed by both example rules.

Written by the indexing model from the issue text.