[Maps] Filter dashboards by drawing on map

[thomasneirynck]

Should be able to filter on dashboards by drawing on a map.

This should behave similar as drawing a shape in the coordinate maps.

One challenge here is that, unlike coordinate maps, it is not entirely clear which geo-field and which index-pattern the filter should be applied on.

[elasticmachine]

Pinging @elastic/kibana-gis

[thomasneirynck]

Required for feature parity with coordinate maps, and part of #31178