fix: floating point precision errors

[butcherZ]

What does it do?

• Round resulting value in increment and decrement functions used in NumberInput component
• Pass onValueChange function in NumberInput story, as it's required for displaying input value

Why is it needed?

Because javascript

0.1+0.2 = 0.30000000000000004

How to test it?

• set step of NumberInput to 0.1
• increment/decrement the input value using arrow keys
• incrementing 0.1 two times, you should get 0.3 instead of 0.30000000000000004

Related issue(s)/PR(s)

1369

#18138 DX-1674

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Latest commit: f758abc73f6ea51da462cf70072666eada1b84fe

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