infinity money bug :D

This is here to show a small miss with big problems.

- add missing test to
  - TransactionEndpoints
  - TransactionControllerTest
- update Transfer with validation for sender receiver
- add SenderReceiverValidator
- add SenderReceiver

src/main/kotlin/ltd/lulz/annotation/SenderReceiver.kt

@@ -0,0 +1,15 @@
+package ltd.lulz.annotation
+
+import jakarta.validation.Constraint
+import jakarta.validation.Payload
+import kotlin.reflect.KClass
+import ltd.lulz.annotation.validator.SenderReceiverValidator
+
+@Constraint(validatedBy = [SenderReceiverValidator::class])
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class SenderReceiver(
+    val message: String = "Receiver and Sender cant be the same account",
+    val groups: Array<KClass<*>> = [],
+    val payload: Array<KClass<out Payload>> = [],
+)