feat(core-flows,payment,medusa,types): Refund reasons management API (#8436)

* feat(core-flows,payment,medusa,types): add ability to set and manage refund reasons

* fix(payment): validate total amount when refunding payment (#8437)

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

* feature: introduce additional_data to the product endpoints (#8405)

* chore(docs): Generated References (#8440)

Generated the following references:
- `product`

* chore: align payment database schema

* Update packages/core/core-flows/src/payment-collection/steps/create-refund-reasons.ts

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

* chore: address review

---------

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>
Co-authored-by: Harminder Virk <virk.officials@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

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

@@ -0,0 +1,54 @@
+import { DALUtils, generateEntityId, Searchable } from "@medusajs/utils"
+import {
+  BeforeCreate,
+  Entity,
+  Filter,
+  OnInit,
+  PrimaryKey,
+  Property,
+} from "@mikro-orm/core"
+
+@Entity({ tableName: "refund_reason" })
+@Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
+export default class RefundReason {
+  @PrimaryKey({ columnType: "text" })
+  id: string
+
+  @Searchable()
+  @Property({ columnType: "text" })
+  label: string
+
+  @Property({ columnType: "text", nullable: true })
+  description: string | null = null
+
+  @Property({ columnType: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null = null
+
+  @Property({
+    onCreate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  created_at: Date
+
+  @Property({
+    onCreate: () => new Date(),
+    onUpdate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  updated_at: Date
+
+  @Property({ columnType: "timestamptz", nullable: true })
+  deleted_at: Date | null = null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "refr")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "refr")
+  }
+}