Testing Runtime Errors

This PR adds end-to-end tests for runtime errors regarding the third coursework.

tests/end-to-end/runtime-errors/div_zero_based_on_input.choc

+# RUN: choco-opt -p all -t riscv %s > %t && echo "" | riscv-interpreter %t | filecheck %s
+
+a: int = 0
+a = len(input())
+
+print(42 // a)
+
+# CHECK: DivByZero: Division by zero