chore: make apis nullable (#7763)

what:

- makes top level attributes of each object an optional field in the http layer where possible

RESOLVES CORE-2229

packages/medusa/src/api/admin/users/validators.ts

@@ -1,9 +1,9 @@
+import { z } from "zod"
 import {
   createFindParams,
   createOperatorMap,
   createSelectParams,
 } from "../../utils/validators"
-import { z } from "zod"
 
 export const AdminGetUserParams = createSelectParams()
 
@@ -18,23 +18,23 @@ export const AdminGetUsersParams = createFindParams({
     created_at: createOperatorMap().optional(),
     updated_at: createOperatorMap().optional(),
     deleted_at: createOperatorMap().optional(),
-    email: z.string().optional(),
-    first_name: z.string().optional(),
-    last_name: z.string().optional(),
+    email: z.string().nullish(),
+    first_name: z.string().nullish(),
+    last_name: z.string().nullish(),
   })
 )
 
 export type AdminCreateUserType = z.infer<typeof AdminCreateUser>
 export const AdminCreateUser = z.object({
   email: z.string(),
-  first_name: z.string().optional(),
-  last_name: z.string().optional(),
-  avatar_url: z.string().optional(),
+  first_name: z.string().nullish(),
+  last_name: z.string().nullish(),
+  avatar_url: z.string().nullish(),
 })
 
 export type AdminUpdateUserType = z.infer<typeof AdminUpdateUser>
 export const AdminUpdateUser = z.object({
-  first_name: z.string().optional(),
-  last_name: z.string().optional(),
-  avatar_url: z.string().optional(),
+  first_name: z.string().nullish(),
+  last_name: z.string().nullish(),
+  avatar_url: z.string().nullish(),
 })