Specify liveness & readiness probes for the pod-identity-webhook

**What would you like to be added**:

This conversation seemed to have sidetracked in [github issue 45](https://github.com/aws/amazon-eks-pod-identity-webhook/issues/45) but typically it's best practices in k8s workloads to define readiness and liveness probes for a deployment. Is it possible to set readiness and liveness probes to monitor this workload?

**Why is this needed**:

Monitor the workload and ensure that the workload is healthy and ready to start processing requests.

Start by locating the Kubernetes Deployment manifest for the pod-identity-webhook and reviewing how the workload currently exposes or reports health. Done means the deployment specifies readiness and liveness probes that monitor the webhook and the resulting configuration can be validated against the workload’s request-processing behavior.

Written by the indexing model from the issue text.