Add an option for control which Pit value is displayed in the RangeSlider

[samouss]

Do you want to request a feature or report a bug?

Feature.

Feature: What is your use case for such a feature?

Right now we display the values at 0, 50 and 100 percent. In some cases we might want to display more / less values in the pits. We should be able to control where & when the pits are append.

Without control (current)

With control (wanted)

What is the version you are using? Always use the latest one before opening a bug issue.

Right now the generation is computed from an array [0, 50, 100]. Maybe we should expose this an option or a function that return an array like this one.

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Linked to #2755

[Haroenv]

related: #2277

[bobylito]

@samouss can you check the PR from @Haroenv and especially give your take on this comment.