feat(medusa,inventory,types): Expand list-reservation capabilities (#3979)

**What**
- Add filter capabilities to reservation items based on: 
  - description query: "contains", "startsWith", "endsWith", "equals"
  - date querying

**How**
- Introducing a new filtering primitive: "StringSearchOperator" resembling the "dateComparisonOperator"

Fixes CORE-1373

packages/inventory/src/services/reservation-item.ts

@@ -60,6 +60,7 @@ export default class ReservationItemService {
     const itemRepository = manager.getRepository(ReservationItem)
 
     const query = buildQuery(selector, config) as FindManyOptions
+
     return await itemRepository.find(query)
   }
 
@@ -79,6 +80,7 @@ export default class ReservationItemService {
     const itemRepository = manager.getRepository(ReservationItem)
 
     const query = buildQuery(selector, config) as FindManyOptions
+
     return await itemRepository.findAndCount(query)
   }