feat: new builtins constr_index and constr_fields for alternative fast ways to take apart Data

examples/acceptance_tests/116/aiken.toml

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+name = "aiken-lang/acceptance_test_116"
+version = "0.0.0"

examples/acceptance_tests/116/lib/tests.ak

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+use aiken/builtin.{constr_index}
+
+test baz() {
+  let x = Some("bar")
+
+  expect [bar] = x |> builtin.constr_fields
+
+  and {
+    constr_index(x) == 0,
+    builtin.un_b_data(bar) == "bar",
+  }
+}