feat(axis): Add minorTick and minorSplitLine

[pissang]

This is a pull request about adding minorTicks, minorSplitLines to axes of carteisan2d and polar coordinate system. It not support category type axis.

Usage:

xAxis: {
    axisTick: {
        // inside will also affect minorTick.
        inside: true,
        length: 20,
        lineStyle: {
            width: 4
        }
    },
    minorTick: {
        show: true,
        length: 10,
        splitNumber: 10,
        lineStyle: {
            color: 'red',
            width: 2
        }
    },
    minorSplitLine: {
        show: true,
        lineStyle: {
            color: 'rgba(255, 0, 0, 0.5)'
        }
    }
}

The default option is in https://github.com/apache/incubator-echarts/compare/minor-ticks?expand=1#diff-af7ed0ab793833949acec7caafa8646eR180

Here is some shots.

With dataZoom.

All tests.

[100pah]

buildAxisMajorTicks buildMinorAxisTicks.

maybe buildAxisMajorTicks buildAxisMinorTicks.
or buildMajorAxisTicks buildMinorAxisTicks.
is better.

But it's not important.

[100pah]

?

[100pah]

The opt seams not be used.

[petersonzilli]

This feature has a bug when used in a dynamic timeseries plot:
it always draws all the 5 ticks (in the example below) leading to a incorrect minorTicks spacing behavior for the right and left-most intervals
As presented in the open issue #18422

How can we correct this issue?

[GordoRank]

This feature has a bug when used in a dynamic timeseries plot: it always draws all the 5 ticks (in the example below) leading to a incorrect minorTicks spacing behavior for the right and left-most intervals As presented in the open issue #18422

How can we correct this issue?

I don't have the time to properly contribute right now as i'm completely swamped, but I've provided a fix for this bug in the comments of issue #18422