Add range capability to the slider control

[FabienLelaquais]

Description

The MaterialUI Slider component accepts an array as its value property, to allow the selection of multiple values on a slider, including a range.

The value property of the slider control should accept a tuple or an array to provide the range selection capability.

The documentation part is taken care of in this issue.

Implementaion notes

The value parsing is a bit more complex.
Instead of

try {
  val = parseInt(defaultValue, 10);
} catch (e) {
}

we should have something like

val = parseInt(defaultValue, 10);
if (isNaN(val )) {
     try {
        val = JSON.parse(defaultValue)
        if (!Array.isArray(val) || val.length === 0 || val.some((n) => isNaN(n))) {
            console.log(`ERROR: Slider range value must a non-empty array of numbers: ${defaultValue}`)
            val = 0
        }
     } catch(e) {
        console.log(`ERROR: Invalid value in slider: ${defaultValue}`)
     }
}

Acceptance Criteria

• Ensure new code is unit tested, and check code coverage is at least 90%
• Ensure there is no breaking change
• Ensure any change is well documented