* setup menu as a render prop sent down from PanelStateWrapper to PanelChrome
* let the Dropdown take care of opening the menu in PanelChrome
* menu and leftItems are on the right side of the header together
* add storybook examples with menu
* menu does not need to be a callback because it's opened in a Dropdown anyway
* pass down to getPanelMenu whether or not data is streaming atm
* stop loading data as well as streaming from menu
* override menu's style where needed
* reduce snapshot matching in tests
