feat: add watch error handler for Kubernetes client

[diafour]

Overview

Add WatchErrorHandler implementation to log informer errors and increase new metric counter.

What this PR does / why we need it

shell-operator will log messages about problems with connection to the apiserver:

{"hook":"pods-v1.sh","level":"error","msg":"kubernetes[0]{crontabs}: Failed to watch ct: failed to list *unstructured.Unstructured: Get \"https://10.96.0.1:443/apis/stable.example.com/v1/crontabs?resourceVersion=369642\": dial tcp 10.96.0.1:443: connect: connection refused","time":"2022-12-13T11:59:21Z"}

# HELP shell_operator_kubernetes_client_watch_errors_total shell_operator_kubernetes_client_watch_errors_total
# TYPE shell_operator_kubernetes_client_watch_errors_total counter
shell_operator_kubernetes_client_watch_errors_total{error_type="fail"} 15

Special notes for your reviewer

Does this PR introduce a user-facing change?