[Feature]: `assert` statement

[angelcaru]

Describe the solution you'd like An assert statement like Python's would be great, and not too hard to implement.

Describe alternatives you've considered Currently, you can do something like: 1 / (condition) and "message", which will divide by zero (and thus, error) if the condition is false. The trailing and is used to display a message. This solution is ugly and not very readable, which is why asserts would be great.

[Almas-Ali]

I was thinking to add this late, but never mind. PR is welcome.