Leader Election: Add callback on new leader detection.
Leader Election: Add callback on new leader detection.

Pensu/contrib,verb/contrib,aledbf/contrib,aledbf/contrib,x13n/contrib,jcmoraisjr/k8s-contrib,aledbf/contrib,aledbf/contrib,x13n/contrib,xialonglee/contrib,jcmoraisjr/k8s-contrib,moul/contrib,jcmoraisjr/k8s-contrib,Pensu/contrib,verb/contrib,moul/contrib,ingvagabund/contrib,piosz/contrib,thockin/contrib,piosz/contrib,widgetpl/contrib,Q-Lee/contrib,foxish/contrib,foxish/contrib,Q-Lee/contrib,jcmoraisjr/k8s-contrib,piosz/contrib,x13n/contrib,ingvagabund/contrib,jcmoraisjr/k8s-contrib,thockin/contrib,x13n/contrib,Q-Lee/contrib,ingvagabund/contrib,moul/contrib,xialonglee/contrib,widgetpl/contrib,verb/contrib,Q-Lee/contrib,verb/contrib,Pensu/contrib,moul/contrib,xialonglee/contrib,widgetpl/contrib,x13n/contrib,foxish/contrib,ingvagabund/contrib,thockin/contrib,piosz/contrib,moul/contrib,x13n/contrib,verb/contrib,widgetpl/contrib,jcmoraisjr/k8s-contrib,foxish/contrib,Q-Lee/contrib,aledbf/contrib,Pensu/contrib,thockin/contrib,aledbf/contrib,thockin/contrib,foxish/contrib,ingvagabund/contrib,xialonglee/contrib,piosz/contrib,xialonglee/contrib,widgetpl/contrib,Q-Lee/contrib,verb/contrib,foxish/contrib,xialonglee/contrib,Pensu/contrib,piosz/contrib,Pensu/contrib,ingvagabund/contrib,widgetpl/contrib,thockin/contrib