Summary:
Support pause resume for kubernetes universes. Pausing a universe will
scale all statefulsets down to 0 pods. No other (kubernetes) actions
will be performed - the volumes will still exist for the universe

Resume will perform a helm upgrade --install --reuse-values, which will
reset all statefulsets back to their original pod count, effectively
resuming the universe

Test Plan: phabricator, local test

Reviewers: #yba-api-review, anijhawan

Reviewed By: #yba-api-review, anijhawan

Subscribers: anijhawan, yugaware, sanketh

Differential Revision: https://phorge.dev.yugabyte.com/D39714