[JSON:API Atomic Operations] Support lid

[SafaAlfulaij]

When dealing with atomic operations, updating local records (added in the operation) requires the lid for the backend to understand what to update.

orbit/packages/@orbit/jsonapi/src/serializers/jsonapi-resource-identity-serializer.ts

Lines 92 to 94 in ea8f97c

	if (resourceId !== undefined) {
	resource.id = resourceId;
	}

The fix is as simple as this:

 if (resourceId !== undefined) {
   resource.id = resourceId;
 } else {
   resource.lid = id
}

But needs a bit of testing and checking if JSON:API allows having lid for all requests (atomic and non-atomic) or not.