feat(codegen): support multi-validators

* rename force_wrap to force
* add a bunch of builder methods to Term<Name>
* refactor one tiny location to show off builder methods
* split generate into `generate` and `generate_test`
* create wrap_as_multi_validator function

Co-authored-by: Kasey White <kwhitemsg@gmail.com>

examples/acceptance_tests/048/validators/foo.ak

@@ -5,8 +5,8 @@ fn when_tuple(a: (Int, Int)) -> Int {
   }
 }
 
-validator spend {
-  fn(a: Data, b: Data, c) -> Bool {
+validator {
+  fn spend(a: Data, b: Data, c) -> Bool {
     when_tuple((4, 1)) == 4
   }
 }