Fix issues and awesome improve the bar3 functionality

[gilbertogalvis]

This PR fix issues and improve the bar3 functionality. bar3 previous version was very poor. This new version is really awesome. This PR was tested for all examples in https://github.com/plotly/ssim_baselines/tree/main/matlab/code-examples/discrete-data-plots/bar3

It is very important to highlight that to use this new functionality TreatAs optional parameter must set to bar3. Example of usage bellow

load count.dat
Z = count(1:10,:);
figure
bar3(Z,'stacked')
title('Stacked Style');

f = fig2plotly(gcf, 'offline', 0, 'TreatAs', 'bar3');

Screenshots of results are shown bellow

links to Chart-Studio:

https://chart-studio.plotly.com/~galvisgilberto/4176/detached-style/#/
https://chart-studio.plotly.com/~galvisgilberto/4178/bar-width-of-05/#/
https://chart-studio.plotly.com/~galvisgilberto/4180/grouped-style/#/
https://chart-studio.plotly.com/~galvisgilberto/4182/stacked-style/#/