feat: Add currency module and remove currency models from region and pricing modules (#6536)

What:
- Creates a new currency module
- Removes currency model from the pricing module
- Removes currency model from region module

packages/region/src/models/currency.ts

@@ -1,16 +0,0 @@
-import { Entity, PrimaryKey, Property } from "@mikro-orm/core"
-
-@Entity({ tableName: "region_currency" })
-export default class Currency {
-  @PrimaryKey({ columnType: "text" })
-  code: string
-
-  @Property({ columnType: "text" })
-  symbol: string
-
-  @Property({ columnType: "text" })
-  symbol_native: string
-
-  @Property({ columnType: "text" })
-  name: string
-}

packages/region/src/models/index.ts

@@ -1,4 +1,2 @@
 export { default as Country } from "./country"
-export { default as Currency } from "./currency"
 export { default as Region } from "./region"
-

packages/region/src/models/region.ts

@@ -14,12 +14,8 @@ import {
   Property,
 } from "@mikro-orm/core"
 import Country from "./country"
-import Currency from "./currency"
 
-type RegionOptionalProps =
-  | "currency"
-  | "countries"
-  | DAL.SoftDeletableEntityDateColumns
+type RegionOptionalProps = "countries" | DAL.SoftDeletableEntityDateColumns
 
 @Entity({ tableName: "region" })
 @Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
@@ -35,13 +31,6 @@ export default class Region {
   @Property({ columnType: "text" })
   currency_code: string
 
-  @ManyToOne({
-    entity: () => Currency,
-    index: "IDX_region_currency_code",
-    nullable: true,
-  })
-  currency?: Currency
-
   @OneToMany(() => Country, (country) => country.region)
   countries = new Collection<Country>(this)