Drilldown manager needs reordering support

**Requestor**

Dale Bingham
Soteria Software

**Problem Statement**

I created several drilldowns on a dashboard, then needed to put the latest one at the top. To do so, I have to delete and recreate every single one. That is a lot of work if I want to just move the ones I have.

**Proposed Solution**

Have a way to move a single drilldown listing up or down one. Or a drag and drop method to reorder them.

**Use Case**

This is in Kibana in the dashboard area, around panels, when you can click the `+` and have a drilldown list to jump to from that table/listing. And add the current filter or not.

**Value / Impact**

This is more a value to users that are displaying related data in dashboards that can have multiple drilldowns, more than 2, off their data to relate it. And have users walk through the data easily versus applying their own filters each time.

I have run into this 3 times now and wanted to say something. I have no idea if this is an edge case or not.

**Urgency**

Not urgent. Just a very nice to have feature.

**Do alternatives or workarounds exist?**

The alternative is to delete and recreate all drilldowns in the proper order. But if your priorities on those change, you do that yet again.

**Related code or customizations**

n/a

**Additional context (Optional)**

**Designs or Specs (Optional)**

Start in the dashboard area around the drilldown list opened from a panel's `+` control, and trace how multiple drilldowns are displayed and configured. Decide whether single-step controls or drag-and-drop fits the request; done means users can reorder drilldowns without deleting and recreating them, while retaining the option to include the current filter.

Written by the indexing model from the issue text.