ioam / holoviews / 15783

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New subplot foundation for Plotly backend (#3255)

* Added new figure_grid utility function

This builds a figure out of a 2D grid of sub figures. It overcomes the limitations
of the make_subplots method because it handles all trace types and it works
recursively

* Convert plotly elements from using `graph_objs` to plain dict instances

This gives us more freedom in the low-level figure manipulation utilities
(those added in `holoviews/plotting/plotly/util.py`) and it is somewhat faster
as well

* Convert figure dict to `plotly.graph_objs.Figure` object during rendering

This way we still get full property validation, but it only happens once at the very
end.

* Convert figure dict to `graph_objs.Figure` in testing

This will trigger property validation errors during testing if any of the
backend operations produce invalid plotly figure dicts

* Switch from `plotly.tools.make_subplots` to `figure_grid`

* Return figure handle if an element produces a figure rather than a trace

* Reduce default subplot spacing slightly for plotly backend

* Remove unused utility functions

* Update figure_grid to treat row indexes as beginning from the bottom

* Remove scaling of shapes in paper coordinates, not complete and not
currently needed.

* Add new test cases

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