feat(link-modules,modules-sdk, utils, types, products) - Remote Link and Link modules (#4695)

What:
- Definition of all Modules links
- `link-modules` package to manage the creation of all pre-defined link or custom ones

```typescript
import { initialize as iniInventory } from "@medusajs/inventory";
import { initialize as iniProduct } from "@medusajs/product";

import {
  initialize as iniLinks,
  runMigrations as migrateLinks
} from "@medusajs/link-modules";

await Promise.all([iniInventory(), iniProduct()]);


await migrateLinks(); // create tables based on previous loaded modules

await iniLinks(); // load link based on previous loaded modules

await iniLinks(undefined, [
  {
    serviceName: "product_custom_translation_service_link",
    isLink: true,
    databaseConfig: {
      tableName: "product_transalations",
    },
    alias: [
      {
        name: "translations",
      },
    ],
    primaryKeys: ["id", "product_id", "translation_id"],
    relationships: [
      {
        serviceName: Modules.PRODUCT,
        primaryKey: "id",
        foreignKey: "product_id",
        alias: "product",
      },
      {
        serviceName: "custom_translation_service",
        primaryKey: "id",
        foreignKey: "translation_id",
        alias: "transalation",
        deleteCascade: true,
      },
    ],
    extends: [
      {
        serviceName: Modules.PRODUCT,
        relationship: {
          serviceName: "product_custom_translation_service_link",
          primaryKey: "product_id",
          foreignKey: "id",
          alias: "translations",
          isList: true,
        },
      },
      {
        serviceName: "custom_translation_service",
        relationship: {
          serviceName: "product_custom_translation_service_link",
          primaryKey: "product_id",
          foreignKey: "id",
          alias: "product_link",
        },
      },
    ],
  },
]); // custom links
```

Remote Link

```typescript
import { RemoteLink, Modules } from "@medusajs/modules-sdk";

// [...] initialize modules and links

const remoteLink = new RemoteLink();

// upsert the relationship
await remoteLink.create({ // one (object) or many (array)
  [Modules.PRODUCT]: {
    variant_id: "var_abc",
  },
  [Modules.INVENTORY]: {
    inventory_item_id: "iitem_abc",
  },
  data: { // optional additional fields
    required_quantity: 5
  }
});

// dismiss (doesn't cascade)
await remoteLink.dismiss({ // one (object) or many (array)
  [Modules.PRODUCT]: {
    variant_id: "var_abc",
  },
  [Modules.INVENTORY]: {
    inventory_item_id: "iitem_abc",
  },
});

// delete
await remoteLink.delete({
  // every key is a module
  [Modules.PRODUCT]: {
    // every key is a linkable field
    variant_id: "var_abc", // single or multiple values
  },
});

// restore
await remoteLink.restore({
  // every key is a module
  [Modules.PRODUCT]: {
    // every key is a linkable field
    variant_id: "var_abc", // single or multiple values
  },
});

```

Co-authored-by: Riqwan Thamir <5105988+riqwan@users.noreply.github.com>

packages/inventory/src/joiner-config.ts

@@ -1,9 +1,14 @@
 import { Modules } from "@medusajs/modules-sdk"
-import { JoinerServiceConfig } from "@medusajs/types"
+import { ModuleJoinerConfig } from "@medusajs/types"
 
-export const joinerConfig: JoinerServiceConfig = {
+export const joinerConfig: ModuleJoinerConfig = {
   serviceName: Modules.INVENTORY,
   primaryKeys: ["id"],
+  linkableKeys: [
+    "inventory_item_id",
+    "inventory_level_id",
+    "reservation_item_id",
+  ],
   alias: [
     {
       name: "inventory_items",

packages/inventory/src/services/inventory.ts

@@ -11,8 +11,8 @@ import {
   IInventoryService,
   InventoryItemDTO,
   InventoryLevelDTO,
-  JoinerServiceConfig,
   MODULE_RESOURCE_TYPE,
+  ModuleJoinerConfig,
   ReservationItemDTO,
   SharedContext,
   UpdateInventoryLevelInput,
@@ -59,7 +59,7 @@ export default class InventoryService implements IInventoryService {
     this.reservationItemService_ = reservationItemService
   }
 
-  __joinerConfig(): JoinerServiceConfig {
+  __joinerConfig(): ModuleJoinerConfig {
     return joinerConfig
   }