chore(): Reorganize modules (#7210)

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

packages/modules/region/src/initialize/index.ts

@@ -0,0 +1,34 @@
+import {
+  ExternalModuleDeclaration,
+  InternalModuleDeclaration,
+  MedusaModule,
+  MODULE_PACKAGE_NAMES,
+  Modules,
+} from "@medusajs/modules-sdk"
+import { IRegionModuleService, ModulesSdkTypes } from "@medusajs/types"
+import { InitializeModuleInjectableDependencies } from "@types"
+
+import { moduleDefinition } from "../module-definition"
+
+export const initialize = async (
+  options?:
+    | ModulesSdkTypes.ModuleServiceInitializeOptions
+    | ModulesSdkTypes.ModuleServiceInitializeCustomDataLayerOptions
+    | ExternalModuleDeclaration
+    | InternalModuleDeclaration,
+  injectedDependencies?: InitializeModuleInjectableDependencies
+): Promise<IRegionModuleService> => {
+  const serviceKey = Modules.REGION
+
+  const loaded = await MedusaModule.bootstrap<IRegionModuleService>({
+    moduleKey: serviceKey,
+    defaultPath: MODULE_PACKAGE_NAMES[Modules.REGION],
+    declaration: options as
+      | InternalModuleDeclaration
+      | ExternalModuleDeclaration,
+    injectedDependencies,
+    moduleExports: moduleDefinition,
+  })
+
+  return loaded[serviceKey]
+}