Charts independent multi axis support

[gabus]

Charts need to support multiple independent axis. Chart which contains two graphs in different scales are hard to read. For example picture bellow

Green graph variation is overwhelmed by much bigger scale blue graph. This makes green graph not very useful.

There are many examples where such chart is needed:

• CPU utilisation vs temperature
• Impressions vs clicks
• Weather temperature vs humidity
• Running cadence vs heart rate

Example what i'm expecting (https://www.highcharts.com/demo/highcharts/combo-dual-axes):

Since two graphs are independent their y axis values are normalised for the given graph. Both graphs are clearly visible and comparable.

Keep in mind I'm giving examples for only two graphs to explain the request better. It should support multiple graphs. For example (https://www.highcharts.com/demo/highcharts/combo-multi-axes):