EuiSuperDatePicker - add customQuickSelectPanels prop

[nreese]

Add customQuickSelectPanels prop to EuiSuperDatePicker.

This prop will allow users to extend EuiSuperDatePicker quick select menu. One such use case is for selecting the entire data set range in Kibana

[chandlerprall]

Changes LGTM; pulled and tested locally

[cchaos]

So I'm really on the fence about the location of this custom items.

It seems quite overkill to have a completely separate section with a heading for one custom link (which could be the most common case). But at the same time it is the most versatile. And yet, on the other hand, if the content provided can only ever behave the same way as the quick select links, it makes the most sense to just append to that list instead of creating a whole new section.

A new section would be more appropriate if you could add any type of content (form elements or links or just text or whatever). So I'm leaning towards, either opening up the new section to be more generic, or just allowing the consumer to tap into the quick select list.

If I'm understanding what's going on correctly

[nreese]

It seems quite overkill to have a completely separate section with a heading for one custom link

In the use case I am envisioning, there will be multiple links, one per index pattern on a dashboard or map plus a "all data sets" link when there are multiple index patterns.

if the content provided can only ever behave the same way as the quick select links, it makes the most sense to just append to that list instead of creating a whole new section.

It is more complicated than just displaying a link. In the use case I am envisioning, the data set range is not know. When the user clicks "entire dataset timerange", the UI will have to display a loading indicator while a min and max aggregation are run against the time field. Once those return, then then applyTime will be called with the values.

[cchaos]

Ok, I'll trust you on this one. But before we add any more sections to this thing we need to consider how large it's getting. It almost doesn't fit on a mobile screen with all sections maxed out.