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

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

@@ -0,0 +1,14 @@
+package net.halfbinary.scavengerhuntapi.model.request
+
+import jakarta.validation.constraints.Future
+import jakarta.validation.constraints.NotBlank
+import java.time.LocalDateTime
+
+data class HuntCreateRequest(
+    @field:NotBlank(message = "Hunt title is required")
+    val title: String,
+    @field:Future
+    val startDateTime: LocalDateTime,
+    @field:Future
+    val endDateTime: LocalDateTime,
+)