Add ToastUI Vue editor to the frontend
## Job To Be Done Add [ToastUI Vue editor](https://github.com/nhn/tui.editor/tree/master/apps/vue-editor) to the frontend and wrap the 3rd party component. ## Behaviour - This should have no impact on the current behavior of the SSE. - No visual changes to our SSE are expected. - All test coverage for the component wrapper should be added as part of this iteration. ## Tasks * [x] Add @toast-ui/vue-editor dependency. * [x] Add the necessary test coverage. * [x] Wrap ToastUI editor in a Vue component (outside of the SSE directory). ## Epic & Design mockups This issue is part of delivering the feature described in https://gitlab.com/gitlab-org/gitlab/-/issues/214559. Mockups: https://gitlab.com/gitlab-org/gitlab/-/issues/214559/designs
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