chore(): Reorganize modules (#7210)

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

packages/modules/payment/src/models/refund.ts

@@ -0,0 +1,71 @@
+import { BigNumberRawValue } from "@medusajs/types"
+import {
+  BigNumber,
+  MikroOrmBigNumberProperty,
+  generateEntityId,
+} from "@medusajs/utils"
+import {
+  BeforeCreate,
+  Entity,
+  ManyToOne,
+  OnInit,
+  PrimaryKey,
+  Property,
+} from "@mikro-orm/core"
+import Payment from "./payment"
+
+@Entity({ tableName: "refund" })
+export default class Refund {
+  @PrimaryKey({ columnType: "text" })
+  id: string
+
+  @MikroOrmBigNumberProperty()
+  amount: BigNumber | number
+
+  @Property({ columnType: "jsonb" })
+  raw_amount: BigNumberRawValue
+
+  @ManyToOne(() => Payment, {
+    onDelete: "cascade",
+    index: "IDX_refund_payment_id",
+    fieldName: "payment_id",
+  })
+  payment!: Payment
+
+  @Property({
+    onCreate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  created_at: Date
+
+  @Property({
+    onCreate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  updated_at: Date
+
+  @Property({
+    columnType: "timestamptz",
+    nullable: true,
+    index: "IDX_refund_deleted_at",
+  })
+  deleted_at: Date | null = null
+
+  @Property({ columnType: "text", nullable: true })
+  created_by: string | null = null
+
+  @Property({ columnType: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null = null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "ref")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "ref")
+  }
+}