fix(numberinput): use native methods for stepping the value up/down

[tay1orjones]

Closes #6684
Closes #12897

Changelog

Changed

• Use native stepUp() and stepDown() methods to step the value up and down

Testing / Reviewing

• Go to the NumberInput playground story, and enter a step of 0.01
• Increment the value with the + stepper many times
• Validate that the input only displays even values incrementing by 0.01
• We should no longer see the invalid behavior of the input getting values with rounding errors of multiple decimal places, like 50.999999998

[alisonjoseph]

🙌 nice!

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[guidari]

LGTM!! 🚀

Looks like we just need to remove the LegacyRef prop, so the lint is good to go!

[tw15egan]

@tay1orjones this is awesome 🙌🏻

[tw15egan]

This will also close #12897