[Security Solution] POC hover actions in embedded dashboards

[semd]

Summary:

Create a POC including the "add to timeline" hover action when the embedded dashboard is rendered inside Security using the current (old) component: getDashboardContainerByValueRenderer.
The final goal is to show the hover action in the table dashboard cells, and chart legends. This POC should test if it is possible using the current architecture.

Implementation:

Actions should be added inside the Security Solution codebase by calling registerAction and attachAction from the uiActions plugin. In a similar fashion as the src/plugins/dashboard/public/plugin.tsx is doing.
We have to add a control in the compatible action method to show the action only when the dashboards are rendered inside Security, otherwise all plugins will show the action as well.

@ThomThomson add any other information you think is relevant.

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[ThomThomson]

Looks great! We should also note that the current getDashboardContainerByValueRenderer will be replaced soon, but if you use it for a POC before the renderer is replaced, we will upgrade it in place for you.