Usability: with_axes() would be better as two methods: with_left_axis(), with_right_axis()

[tlisonbee]

Axis configuration on charts currently models the SignalFx REST API but it would be more developer friendly if it was changed.

Current API is a with_axes() method that takes an array with 1 or 2 AxisOptions, there is also a with_axis_precision() method that could move:

AxisOption(min=None, max=None, label='', high_watermark=None, low_watermark=None)

.with_axes([AxisOption(label="Count", min=0), AxisOption(label="Latency", min=0)])

.with_axis_precision(num)

Suggested API on charts:

.with_left_axis(label="", min=None, max=None, low_watermark=None, high_watermark=None, axis_precision=None)
.with_right_axis(label="", min=None, max=None, low_watermark=None, high_watermark=None, axis_precision=None)

(also, I think axis_precision is only currently supported for the left axis, above is suggested for both)