feat(region): Region create, delete, update admin endpoints (#6332)

**What**
Add `POST /admin/regions`
Add `POST /admin/regions/:id`
Add `DELETE /admin/regions/:id`

All are added for v2 using API Routes and workflows.

In follow-up PRs, I will add support for passing countries in update and create.

Update: First follow-up PR is #6372

packages/types/src/region/mutations.ts

@@ -1,24 +1,22 @@
-import { RegionCurrencyDTO } from "./common"
-
 export interface CreateRegionDTO {
   name: string
   currency_code: string
-  currency?: RegionCurrencyDTO
   countries?: string[]
-  tax_code?: string
-  tax_rate?: number
-  tax_provider_id?: string
+  metadata?: Record<string, unknown>
 }
 
 export interface UpdateRegionDTO {
   id: string
   currency_code?: string
-  currency?: RegionCurrencyDTO
-  countries: string[]
+  countries?: string[]
   name?: string
-  tax_code?: string
-  tax_rate?: number
-  tax_provider_id?: string
+  metadata?: Record<string, unknown>
+}
+
+export interface UpdatableRegionFields {
+  currency_code?: string
+  name?: string
+  metadata?: Record<string, unknown>
 }
 
 export interface AddCountryToRegionDTO {

packages/types/src/region/service.ts

@@ -10,14 +10,27 @@ import {
   RegionCurrencyDTO,
   RegionDTO,
 } from "./common"
-import { CreateRegionDTO, UpdateRegionDTO } from "./mutations"
+import {
+  CreateRegionDTO,
+  UpdatableRegionFields,
+  UpdateRegionDTO,
+} from "./mutations"
 
 export interface IRegionModuleService extends IModuleService {
   create(data: CreateRegionDTO[], sharedContext?: Context): Promise<RegionDTO[]>
   create(data: CreateRegionDTO, sharedContext?: Context): Promise<RegionDTO>
 
-  update(data: UpdateRegionDTO[], sharedContext?: Context): Promise<RegionDTO[]>
-  update(data: UpdateRegionDTO, sharedContext?: Context): Promise<RegionDTO>
+  update(data: UpdateRegionDTO[]): Promise<RegionDTO[]>
+  update(
+    selector: FilterableRegionProps,
+    data: UpdatableRegionFields,
+    sharedContext?: Context
+  ): Promise<RegionDTO[]>
+  update(
+    regionId: string,
+    data: UpdatableRegionFields,
+    sharedContext?: Context
+  ): Promise<RegionDTO>
 
   delete(ids: string[], sharedContext?: Context): Promise<void>
   delete(id: string, sharedContext?: Context): Promise<void>