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/script_context/validators/mint.ak

@@ -3,8 +3,8 @@ use aiken/list
 use aiken/transaction.{Mint, ScriptContext}
 use aiken/transaction/value
 
-validator mint {
-  fn(redeemer: Data, ctx: ScriptContext) {
+validator {
+  fn mint(redeemer: Data, ctx: ScriptContext) {
     [
       assert_purpose(ctx),
       assert_mint(ctx.purpose, ctx.transaction),