[Browser] Better canvas visualization when drilling into nodes (double click)

[shahar-biron]

1. When performing "sub-queries" by double clicking nodes, the canvas is re-organized.
   Instead, a better experience is if the new nodes added as a result of the double-click action, will be added to the graph where there is free space.

2. When moving a nodes which has adjacent nodes, currently dragging a node does not move any other node, which is cumbersome (as the user will need manually to drag "child" nodes it the vicinity of the root node. It is better to "move" the child nodes together with the root node.

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