[Lens] Move Pie/Treemap settings to the toolbar

[cchaos]

Now that there's space to house Chart-specific settings, We should move the pie/treemap settings there as well.

Easy tackle:

Longer term: Would be to break apart some of those settings into their own toolbar button like have ones specifically for "Legend" and "Labels".

[elasticmachine]

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

[flash1293]

This is part of my legend config Pr as well, please don’t start separate work.