feat(css): Add padding utility

mentioned in commit 73de2bb7

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!1967 (merged)

mentioned in merge request rpadovani/daintree!151 (merged)

mentioned in merge request status-page!87 (closed)

mentioned in merge request gitlab!34433 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!1971 (merged)

mentioned in merge request status-page!94 (merged)