[Maps] double clicking to delete shape produces failure to delete error

[mattkime]

When removing a shape, double clicking can lead to two delete requests for the same shape which results in an error.

Untitled.mov

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[nreese]

There is more to this issue than just the original description. Adding and deleting features is an asynchronous task takes an unknown amount of time. There needs to be user feedback that something is happening while features are being added and deleted and during this time. Proper user feedback will prevent users from double clicking and so on because those action will be disabled will add/delete action is taking place.

Redux action addNewFeatureToIndex and deleteFeatureFromIndex need to set draw_mode to "insert" or "delete" before performing their async request and then return draw_mode to "simple_select" after the async task has finished.

Finally DrawControl needs to display a "wait" icon while the draw_mode is "insert" or "delete".