feat: add simulation action definitions

simulation/definitions/ProfessionDefinition.gd

@@ -0,0 +1,13 @@
+class_name ProfessionDefinition
+extends Resource
+
+@export var profession_id: StringName
+@export var display_name: String
+
+func validate() -> Array[String]:
+	var errors: Array[String] = []
+	if profession_id.is_empty():
+		errors.append("profession_id is empty")
+	if display_name.is_empty():
+		errors.append("display_name is empty for '%s'" % profession_id)
+	return errors