Lab 11 - Puppy Notification

[willshen8]

Create cmd/lostpuppy-service/main.go running single endpoint:
POST /api/lostpuppy/ Payload: { id: PUPPY_ID }
This stubbed endpoint returns with 2 second delay:

HTTP status 201 for even IDs
HTTP status 500 for odd IDs

Update Puppy Delete method to notify lostpuppy-service in a goroutine and log response code asynchronously.