add List/sum and List/range built-ins

[Sipher]

Added an inclusive List/range built-in to bend

Tested multiple examples, all of them seem to be working

[guarilha]

Tested multiple examples, all of them seem to be working

Can you include the tests on this PR too, please?

[Sipher]

Tested multiple examples, all of them seem to be working

Can you include the tests on this PR too, please?

I wrote simple tests for the functions, did not find any asserts/test suit in the repo

[nicolas-abril]

In the future we should test the prelude/standard library like other regular Bend programs, but for now we can create a new test suite that just runs some simple test programs for the builtins.

In tests/golden_tests.rs you can create a new test function called builtins that is identical to the io function.

Then, in tests/golden_tests/ you can create a new directory called builtins and put your test programs inside.