chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

packages/modules/payment/src/joiner-config.ts

@@ -0,0 +1,61 @@
+import { Modules } from "@medusajs/modules-sdk"
+import { ModuleJoinerConfig } from "@medusajs/types"
+import { MapToConfig } from "@medusajs/utils"
+import {
+  Payment,
+  PaymentCollection,
+  PaymentProvider,
+  PaymentSession,
+} from "@models"
+
+export const LinkableKeys = {
+  payment_id: Payment.name,
+  payment_collection_id: PaymentCollection.name,
+  payment_provider_id: PaymentProvider.name,
+}
+
+const entityLinkableKeysMap: MapToConfig = {}
+Object.entries(LinkableKeys).forEach(([key, value]) => {
+  entityLinkableKeysMap[value] ??= []
+  entityLinkableKeysMap[value].push({
+    mapTo: key,
+    valueFrom: key.split("_").pop()!,
+  })
+})
+
+export const entityNameToLinkableKeysMap: MapToConfig = entityLinkableKeysMap
+
+export const joinerConfig: ModuleJoinerConfig = {
+  serviceName: Modules.PAYMENT,
+  primaryKeys: ["id"],
+  linkableKeys: LinkableKeys,
+  alias: [
+    {
+      name: ["payment", "payments"],
+      args: {
+        entity: Payment.name,
+        methodSuffix: "Payments",
+      },
+    },
+    {
+      name: ["payment_collection", "payment_collections"],
+      args: {
+        entity: PaymentCollection.name,
+      },
+    },
+    {
+      name: ["payment_session", "payment_sessions"],
+      args: {
+        entity: PaymentSession.name,
+        methodSuffix: "PaymentSessions",
+      },
+    },
+    {
+      name: ["payment_provider", "payment_providers"],
+      args: {
+        entity: PaymentProvider.name,
+        methodSuffix: "PaymentProviders",
+      },
+    },
+  ],
+}