Part of https://github.com/KittyCAD/modeling-app/issues/4600
Adds support for keyword arguments to the stdlib, and calling stdlib functions with keyword arguments.
So far, I've changed one function: `rem`. Previously you would have used `rem(7, 2)` but now it's `rem(7, divisor: 2)`.
This is a proof-of-concept. If it's approved, we will:
1. Support closures with keyword arguments, and calling them
2. Move the rest of the stdlib to use kw arguments
6366bc4766