Add new script_context acceptance scenario for withdrawals.

examples/acceptance_tests/script_context/validators/withdrawals.ak

@@ -0,0 +1,35 @@
+use aiken/dict
+use aiken/list
+use aiken/transaction.{ScriptContext}
+use aiken/transaction/credential.{
+  Inline, ScriptCredential, VerificationKeyCredential,
+}
+
+fn spend(_datum: Void, _redeemer: Void, ctx: ScriptContext) {
+  let alice =
+    Inline(
+    VerificationKeyCredential(
+      #"22222222222222222222222222222222222222222222222222222222",
+    ))
+    
+
+  let bob =
+    Inline(
+    ScriptCredential(
+      #"5e1e8fa84f2b557ddc362329413caa3fd89a1be26bfd24be05ce0a02",
+    ))
+    
+
+  [
+    when dict.get(ctx.transaction.withdrawals, alice) is {
+      None -> error("alice's withdrawal not found")
+      Some(value) -> value == 42
+    },
+    when dict.get(ctx.transaction.withdrawals, bob) is {
+      None -> error("bob's withdrawal not found")
+      Some(value) -> value == 14
+    },
+    dict.keys(ctx.transaction.withdrawals) == [alice, bob],
+  ]
+  |> list.and
+}