Introduce lifecycle plugin for metrics-server to allow
managing the application's behavior during different
phases of its lifecycle.
This is required to allow adding labels to the pods and
restart them right after the application is applied,
which is going to be implemented by a follow-up commit.
Test Plan:
PASS: build-pkgs -c -p python3-k8sapp-metrics-server
PASS: build-pkgs -c -p stx-metrics-server-helm
PASS: upload/apply/remove/delete/update metrics-server
PASS: possible to access hooks like post-apply and post-remove
Story: 2010962
Task: 49066
Change-Id: If2e334e238ac51795907b4c6076d7bebe3ce9739
Signed-off-by: David Barbosa Bastos <david.barbosabastos@windriver.com>
e6e0266610