Issues with the focusedNodeId capability

[danielcaldas]

Describe the bug
This is a follow up to #374 and #341. Although some of the bugs concerning the animated zoom capabilities were addressed, there are still a few gaps that need to be addressed, although with lower priority.

To Reproduce

• onZoomChange prop isn't properly called when zooming in on focused node
  I tried to add this in .on('end', _zoomEnd) in _zoomConfig but that zoom function isn't called at all when focusing on a node id
  • Putting it in UNSAFE_componentWillReceiveProps caused an infinite loop and a crash
• Trying to zoom (with the mouse wheel) while a node is focused causes a weird "jump" in the zoom level (the focused node zoom seems to take precedence but only after an update)
• Trying to pan while there's a focusedNodeId can have unpredictable results; sometimes it will "jump" around and sometimes it won't

Thanks, @TranquilMarmot for the details.

Expected behavior
The above-described bugs should go away.

Environment:

• OS: All
• Browser: All
• react-d3-graph version: >=2.5.0
• d3 version: not relevant
• react version: not relevant

Additional context
For additional context check the first PR #341