Feature: rangeArea compatibility

[Buddy-Matt]

I've added in some functionality to allow plotting of the new "areaRange" chart type (https://apexcharts.com/angular-chart-demos/range-area-charts/combo/)

There are a few niggles - such as the pop-up values not quite working properly (it appears they've changed how this works specifically for rangeArea charts) - but it works well enough for my needs, so thought I'd share it back with you for further development.

There's also a new bit of code to allow specific legend items to be hidden - mainly because this was easier to implement than plotting the mean & range from a single series.

Example of the chart in action - replicating the Home Assistant statistics history card look & feel (which is basically the functionality I want):

and the YAML to get this going:

type: custom:apexcharts-card
entities:
  - entity: sensor.smart_meter_electricity_power
    name: Grid Power (range)
    color: rgb(255,0,0)
    stroke_width: 0
    opacity: 0.3
    type: rangeArea
    statistics:
      type: range
      period: 5minute
    show:
      legend: false
  - entity: sensor.smart_meter_electricity_power
    name: Grid Power
    color: rgb(255,0,0)
    stroke_width: 1
    type: line
    statistics:
      type: mean
      period: 5minute

[GustavSVJ]

Is there anything I can do to help get this closed?