feat: added initialRangeSelected

[OtavioStasiak]

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Objective

- Add two new props ( initialHighValue, initialLowValue};
- If you set this props on RangeSlider component you can set a initial value when the component mount;
- This values (initialLowValue and initialHighValue) should be between min an max props;

How to test

- import RangeSlider component;
- set initialLowValue and initialHighValue (this values should be between min and max);
- when the component mount, you will see the result;