chore(): Reorganize modules (#7210)

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

packages/modules/cart/src/models/shipping-method-adjustment.ts

@@ -0,0 +1,69 @@
+import {
+  DALUtils,
+  createPsqlIndexStatementHelper,
+  generateEntityId,
+} from "@medusajs/utils"
+import {
+  BeforeCreate,
+  Entity,
+  Filter,
+  ManyToOne,
+  OnInit,
+  Property,
+} from "@mikro-orm/core"
+import AdjustmentLine from "./adjustment-line"
+import ShippingMethod from "./shipping-method"
+
+const ShippingMethodIdIndex = createPsqlIndexStatementHelper({
+  name: "IDX_adjustment_shipping_method_id",
+  tableName: "cart_shipping_method_adjustment",
+  columns: "shipping_method_id",
+  where: "deleted_at IS NULL",
+}).MikroORMIndex
+
+const PromotionIdIndex = createPsqlIndexStatementHelper({
+  name: "IDX_shipping_method_adjustment_promotion_id",
+  tableName: "cart_shipping_method_adjustment",
+  columns: "promotion_id",
+  where: "deleted_at IS NULL AND promotion_id IS NOT NULL",
+}).MikroORMIndex
+
+const DeletedAtIndex = createPsqlIndexStatementHelper({
+  tableName: "cart_shipping_method_adjustment",
+  columns: "deleted_at",
+  where: "deleted_at IS NOT NULL",
+}).MikroORMIndex
+
+@Entity({ tableName: "cart_shipping_method_adjustment" })
+@Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
+export default class ShippingMethodAdjustment extends AdjustmentLine {
+  @ManyToOne({ entity: () => ShippingMethod, persist: false })
+  shipping_method: ShippingMethod
+
+  @ShippingMethodIdIndex()
+  @ManyToOne({
+    entity: () => ShippingMethod,
+    columnType: "text",
+    fieldName: "shipping_method_id",
+    mapToPk: true,
+  })
+  shipping_method_id: string
+
+  @PromotionIdIndex()
+  @Property({ columnType: "text", nullable: true })
+  promotion_id: string | null = null
+
+  @DeletedAtIndex()
+  @Property({ columnType: "timestamptz", nullable: true })
+  deleted_at: Date | null = null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "casmadj")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "casmadj")
+  }
+}