Create User Permission Handler

curl --request POST \
  --url http://localhost:8000/v1/user-permissions \
  --header 'Content-Type: application/json' \
  --data '
{
  "tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "path_part_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "path_part_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "materialized_path": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}