chore(): Reorganize modules (#7210)

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

packages/modules/inventory-next/src/repositories/index.ts

@@ -0,0 +1,2 @@
+export * from "./inventory-level"
+export { MikroOrmBaseRepository as BaseRepository } from "@medusajs/utils"

packages/modules/inventory-next/src/repositories/inventory-level.ts

@@ -0,0 +1,72 @@
+import { Context } from "@medusajs/types"
+import { InventoryLevel } from "@models"
+import { SqlEntityManager } from "@mikro-orm/postgresql"
+import { mikroOrmBaseRepositoryFactory } from "@medusajs/utils"
+
+export class InventoryLevelRepository extends mikroOrmBaseRepositoryFactory(
+  InventoryLevel
+) {
+  async getReservedQuantity(
+    inventoryItemId: string,
+    locationIds: string[],
+    context: Context = {}
+  ): Promise<number> {
+    const manager = super.getActiveManager<SqlEntityManager>(context)
+
+    const [result] = (await manager
+      .getKnex()({ il: "inventory_level" })
+      .sum("reserved_quantity")
+      .whereIn("location_id", locationIds)
+      .andWhere("inventory_item_id", inventoryItemId)) as {
+      sum: string
+    }[]
+
+    return parseInt(result.sum)
+  }
+
+  async getAvailableQuantity(
+    inventoryItemId: string,
+    locationIds: string[],
+    context: Context = {}
+  ): Promise<number> {
+    const knex = super.getActiveManager<SqlEntityManager>(context).getKnex()
+
+    const [result] = (await knex({
+      il: "inventory_level",
+    })
+      .sum({
+        stocked_quantity: "stocked_quantity",
+        reserved_quantity: "reserved_quantity",
+      })
+      .whereIn("location_id", locationIds)
+      .andWhere("inventory_item_id", inventoryItemId)) as {
+      reserved_quantity: string
+      stocked_quantity: string
+    }[]
+
+    return (
+      parseInt(result.stocked_quantity) - parseInt(result.reserved_quantity)
+    )
+  }
+
+  async getStockedQuantity(
+    inventoryItemId: string,
+    locationIds: string[],
+    context: Context = {}
+  ): Promise<number> {
+    const knex = super.getActiveManager<SqlEntityManager>(context).getKnex()
+
+    const [result] = (await knex({
+      il: "inventory_level",
+    })
+      .sum({
+        stocked_quantity: "stocked_quantity",
+      })
+      .whereIn("location_id", locationIds)
+      .andWhere("inventory_item_id", inventoryItemId)) as {
+      stocked_quantity: string
+    }[]
+
+    return parseInt(result.stocked_quantity)
+  }
+}