emit events on scaling

[Maanas-23]

An example of a created event:

action: Scale
apiVersion: v1
eventTime: null
firstTimestamp: null
involvedObject:
  apiVersion: elasti.truefoundry.com/v1alpha1
  kind: ElastiService
  name: httpbin
  namespace: demo
kind: Event
lastTimestamp: null
message: Successfully scaled Deployments from zero to 1 replicas
metadata:
  creationTimestamp: "2025-02-17T09:24:08Z"
  generateName: httpbin-
  name: httpbin-df5fg
  namespace: demo
  resourceVersion: "119479"
  uid: f95a91ed-a54a-4951-ad69-af32df6787c2
reason: ScaledUpFromZero
reportingComponent: ""
reportingInstance: ""
source:
  component: elasti-operator
type: Normal