Improve gridline rendering on multi-layer time axis

[markov00]

Is your feature request related to a problem? Please describe.
With the new multilayer time axis, not all gridlines are shown. Only the major gridline is represented, but not all the sub layers.

Describe the solution you'd like
I'd like to:

• give the ability to render all the grid lines (major, minor, background) lines or just the selected ones
• improve the color/thinkness/opacity to make it works well on most cases, even denser ones.

To get all the layers you can easily change the following line:

elastic-charts/packages/charts/src/chart_types/xy_chart/axes/timeslip/multilayer_ticks.ts

Line 95 in 0706ebd

notTooDense(domainFromS, domainToS, binWidth, cartesianWidth, MAX_TIME_GRID_COUNT)(l),

with a true.

Additional context

The timeslip prototype was great and the gridlines was a very valuable piece of the implementation. I don't see anymore a reason to not showing all the nice little details of such prototype.

[nickofthyme]

If possible I'd like to see this in all xy chart axes, especially for log scales, not just for multi-layer time axis. Similar to how excel offers major and minor axis configurations.