chore(): Reorganize modules (#7210)

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

packages/modules/payment/src/module-definition.ts

@@ -0,0 +1,41 @@
+import { ModuleExports } from "@medusajs/types"
+
+import { PaymentModuleService } from "@services"
+
+import loadConnection from "./loaders/connection"
+import loadContainer from "./loaders/container"
+import loadProviders from "./loaders/providers"
+import loadDefaults from "./loaders/defaults"
+
+import { Modules } from "@medusajs/modules-sdk"
+import { ModulesSdkUtils } from "@medusajs/utils"
+
+import * as PaymentModels from "@models"
+
+const migrationScriptOptions = {
+  moduleName: Modules.PAYMENT,
+  models: PaymentModels,
+  pathToMigrations: __dirname + "/migrations",
+}
+
+export const runMigrations = ModulesSdkUtils.buildMigrationScript(
+  migrationScriptOptions
+)
+export const revertMigration = ModulesSdkUtils.buildRevertMigrationScript(
+  migrationScriptOptions
+)
+
+const service = PaymentModuleService
+const loaders = [
+  loadContainer,
+  loadConnection,
+  loadProviders,
+  loadDefaults,
+] as any
+
+export const moduleDefinition: ModuleExports = {
+  service,
+  loaders,
+  runMigrations,
+  revertMigration,
+}