chore(): Reorganize modules (#7210)

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

packages/modules/region/src/models/country.ts

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+import { Entity, ManyToOne, PrimaryKey, Property } from "@mikro-orm/core"
+
+import { createPsqlIndexStatementHelper } from "@medusajs/utils"
+import Region from "./region"
+
+// We don't need a partial index on deleted_at here since we don't support soft deletes on countries
+const regionIdIsoIndexName = "IDX_region_country_region_id_iso_2_unique"
+const RegionIdIsoIndexStatement = createPsqlIndexStatementHelper({
+  name: regionIdIsoIndexName,
+  tableName: "region_country",
+  columns: ["region_id", "iso_2"],
+  unique: true,
+})
+
+RegionIdIsoIndexStatement.MikroORMIndex()
+@Entity({ tableName: "region_country" })
+export default class Country {
+  @PrimaryKey({ columnType: "text" })
+  @Property({ columnType: "text" })
+  iso_2: string
+
+  @Property({ columnType: "text" })
+  iso_3: string
+
+  @Property({ columnType: "int" })
+  num_code: number
+
+  @Property({ columnType: "text" })
+  name: string
+
+  @Property({ columnType: "text" })
+  display_name: string
+
+  @Property({ columnType: "text", nullable: true })
+  region_id?: string | null = null
+
+  @ManyToOne({
+    entity: () => Region,
+    fieldName: "region_id",
+    nullable: true,
+    onDelete: "set null",
+  })
+  region?: Region | null
+}

packages/modules/region/src/models/index.ts

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+export { default as Country } from "./country"
+export { default as Region } from "./region"

packages/modules/region/src/models/region.ts

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+import { DAL } from "@medusajs/types"
+import { DALUtils, Searchable, generateEntityId } from "@medusajs/utils"
+import {
+  BeforeCreate,
+  Collection,
+  Entity,
+  Filter,
+  Index,
+  OnInit,
+  OneToMany,
+  OptionalProps,
+  PrimaryKey,
+  Property,
+} from "@mikro-orm/core"
+import Country from "./country"
+
+type RegionOptionalProps = "countries" | DAL.SoftDeletableEntityDateColumns
+
+@Entity({ tableName: "region" })
+@Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
+export default class Region {
+  [OptionalProps]?: RegionOptionalProps
+
+  @PrimaryKey({ columnType: "text" })
+  id: string
+
+  @Searchable()
+  @Property({ columnType: "text" })
+  name: string
+
+  @Searchable()
+  @Property({ columnType: "text" })
+  currency_code: string
+
+  @Property({ columnType: "boolean" })
+  automatic_taxes = true
+
+  @OneToMany(() => Country, (country) => country.region)
+  countries = new Collection<Country>(this)
+
+  @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
+
+  @Index({ name: "IDX_region_deleted_at" })
+  @Property({ columnType: "timestamptz", nullable: true })
+  deleted_at: Date | null = null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "reg")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "reg")
+  }
+}