Ability to set human readable title of data view

[sorenlouv]

Currently it is not possible to set a human readable title of a data view. Instead the index pattern of the data view is used as the title.

This can be quite long and confusing, especially for auto-generated data views like the one for APM which is displayed as traces-apm*,apm-*,logs-apm*,apm-*,metrics-apm*,apm-*:

It would be better if it was possible to set a human readable title like APM UI. This would also make sure it is easy to distinguish APM's data view (bottom) from User Experience's data view (top).

It still makes sense to show the index pattern on hover so the user knows what it covers (although they can always go to Stack Management to see that)

@mattkime