feat(hog): print ast in console

[mariusandra]

Problem

Changes

Running print(expr) prints out the (unsanitized) SQL, just running expr in the console will still show the classes.

I couldn't get the latter to work even though there should be a __repr__(self) you can override.

I also added a to_hogql() function that just returns the printed HogQL.

How did you test this code?

See above