Implements Hunt basic create and get, and adds field validation to controllers

src/main/kotlin/net/halfbinary/scavengerhuntapi/model/request/LoginRequest.kt

@@ -1,6 +1,10 @@
 package net.halfbinary.scavengerhuntapi.model.request
 
+import jakarta.validation.constraints.NotBlank
+
 data class LoginRequest(
+    @field:NotBlank(message = "Email cannot be blank")
     val email: String,
+    @field:NotBlank(message = "Password cannot be blank")
     val password: String
 )