Provide a ContextMenu component

In Cockpit we currently have our own ContextMenu component , currently not really re-usable. Now that we are working on a plugin that also needs a ContextMenu, I've been thinking about making it re-usable.

In today's PF community meeting I noticed that the react-topology package also includes a contextmenu component.

Maybe it would be beneficial if that was moved here? I haven't looked into the re-usability of the react-topology's contextmenu for our use case but I can imagine there might be more projects using PF which could use it.

Jira Issue: PF-2017

まず、Cockpit の pkg/lib/cockpit-components-context-menu.jsx と、react-topology の packages/module/src/components/contextmenu にある contextmenu コンポーネントを比較します。react-topology コンポーネントが、記載されている Cockpit およびその他の PatternFly のユースケースをサポートしているかを確認し、再利用可能なコンポーネントのスコープと統合ポイントを定義します。共有の ContextMenu コンポーネントがプラグインのユースケースで利用可能になれば完了です。