feat: NumberInput support long presses

[JonZhang3]

Description
The NumberInput component can be stepped up or down by long-pressing the Plus/Minus buttons.

Related issue(s)
#734

What kind of change does this PR introduce? (check at least one)

• Bug fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Refactor
• Build-related changes
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Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

How has This been tested?

Screenshots (if appropriate):

The PR fulfills these requirements:

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