refactor buyer and insured and add more policy types

lib/policy_service/aggregates/fire_structure_policy_application.ex

@@ -0,0 +1,22 @@
+defmodule PolicyService.Aggregates.FireStructurePolicyApplication do
+  use PolicyService.Aggregates.PolicyApplication,
+    policy_type: "fire_structure",
+    commands: PolicyService.Commands.FireStructurePolicy
+
+  def validate_details(%{
+        "location" => location,
+        "property_value" => value,
+        "property_use" => use_type,
+        "security_measures" => measures,
+        "market_value" => market_value
+      })
+      when is_binary(location) and byte_size(location) > 0 and
+             is_number(value) and value > 0 and
+             is_binary(use_type) and byte_size(use_type) > 0 and
+             is_list(measures) and
+             is_number(market_value) and market_value > 0 do
+    :ok
+  end
+
+  def validate_details(_), do: {:error, :invalid_fire_structure_details}
+end