[EuiDualRange] Support custom content in popover

[cqliu1]

I'm using EuiDualRange for the new range slider control in Dashboard. In our use case we wanted to have the field name displayed as the title in the popover, help text or an error message under the dual range within the popover, and an additional button for clearing out the user's selection.

To achieve all of that, I had to create a custom popover instead of using the built in dual range popover. Would there be a way to support additional props to add these things to built in popover?

[cchaos]

My thoughts on this would be doing something similar to EuiSelectable where we pass back the input and the slider from a render function that the consumer can then place anywhere they want.

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[JasonStoltz]

It looks like this should have been closed.