What is the underlying problem you're trying to solve?

Need implementation of rand.intn to be used in policies

Expected Outcome

• rand.intn(key, n) can be used in policies
• The result of rand.intn(key, n) call is consistent for the duration of a given evaluation provided both arguments are the same
• All rand tests pass: https://github.com/open-policy-agent/opa/tree/main/v1/test/cases/testdata/v1/rand