[Lens] Option to disable interactions

[flash1293]

In the current state Lens charts (like the xy chart or the table) will always offer interactivity (e.g. brushing a range on the x axis, clicking a bar or using +/- buttons in table cells).

In some contexts this is not desired, for example when using a lens vis in canvas.

In this case the embeddable input option disableTriggers is set to true. This information could be passed to the renderer via a variable, making it also usable from within the expression for later use cases.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[wylieconlon]

@flash1293 I was a bit confused by the description, because we don't actually trigger any actions when disableTriggers is set to true. But I think your are referring to the same issue that @cqliu1 has previously talked about: it looks like you can interact with Lens, even though it has no effect. disableTriggers should completely prevent the interactions that would normally take place, for example not showing a grabby cursor or drag handles.

[wylieconlon]

@cqliu1 Do you think this issue is still needed?