chore: Initialize method for modules (#3649)

What:
- Export initialize methods for all modules to be used as a package.
- Export `runMigrations` and `revertMigration` on modules that DB migrations are available

```typescript
import {
  initialize as initializeInventory,
  InventoryServiceInitializeOptions,
  runMigrations as runMigrationsInventory,
} from "@medusajs/inventory";

import { initialize as eventBusInitialize } from "@medusajs/event-bus-redis";

import { initialize as cacheInitialize } from "@medusajs/cache-redis";

const eventBus = await eventBusInitialize({
  redisUrl: "localhost",
});

const cache = await cacheInitialize({
  redisUrl: "localhost",
});

const options: InventoryServiceInitializeOptions = {
  database: {
    type: "postgres",
    url: `postgres://postgres:@localhost/inventory`,
  },
};

await runMigrationsInventory({
  options,
});

const inventoryService = await initializeInventory(options, {
  eventBusService: eventBus,
});

const sku = "sku_123"
const item = await service.createInventoryItem({
  sku,
});

cache.set(sku, { item });

```

packages/types/src/modules-sdk/index.ts

@@ -90,10 +90,10 @@ export type ModuleExports = {
   models?: Constructor<any>[]
   runMigrations?(
     options: LoaderOptions,
-    moduleDeclaration: InternalModuleDeclaration
+    moduleDeclaration?: InternalModuleDeclaration
   ): Promise<void>
   revertMigration?(
     options: LoaderOptions,
-    moduleDeclaration: InternalModuleDeclaration
+    moduleDeclaration?: InternalModuleDeclaration
   ): Promise<void>
 }