Implement custom css easing curves

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Problem

GitLab is currently lacking in terms of easing curves to use for animations.

Proposal

https://gitlab.com/gitlab-org/design.gitlab.com/issues/314 documents new intended css animation easing curves. This issue focuses on implementing custom css easing curves to support that

Adding https://gist.github.com/bendc/ac03faac0bf2aee25b49e5fd260a727d