Elastic-charts Usability Enhancements

[markov00]

A list of simple fixes to greatly improve the style of our charts

Relatively simple tasks

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1. [cartesian] improve gridlines z-index #2121
   :axis :xy enhancement +3
2. [cartesian] don't render grid lines above/below the axis line #2123
   :axis :xy enhancement +3
3. [axis] Improve the default/EUI axis and grid style #2130
   :axis :styling :xy design enhancement needs design +6
   
4. [cartesian] Use only multi-layer time axis style #2125
   :axis :xy enhancement +3
5. [cartesian] near the edges rendering #2129
   :chart :xy enhancement +3
6. [Bar chart] Configure the max width of the bars #1908
   :Lens :xy enhancement kibana cross issue +4
7. [cartesian] Provide numerical axis tick formatting out-of-the-box #2126
   :axis :xy enhancement +3
8. style(xy): expose isolated point style #2004
   :theme +1
9. fix(axis): reduce number of y axis ticks on linear scale #2005
   :data +1

And few bigger fixes that might be interesting to keep in mind:

More complex tasks

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1. [partition] Improve treemap style #2127
   :partition +1
   
2. [partition] improve pie chart labelling #2128
   0 of 2
   :partition design enhancement +3
   
3. Inconsistent placement of fillLabel #599
   :partition enhancement +2