NumberInput enhancement: have an option to allow integers only

[jinzih]

Use this template if you want to request a new feature, or a change to an
existing feature.

If you are reporting a bug or problem, please use the bug template instead.

Summary

NumberInput is a handy component to use, however, it will be good if it has an option to allow integer numbers only.

Please describe your request in one or two sentences.
NumberInput is a handy component to use, however, it will be good if it has an option to allow integer numbers only.

Clarify if you are asking for design, development, or both design and
development.

Development

Justification

Provide the business reasons for this request.
we use NumberInput for some cases that only allow integers.

Desired UX and success metrics

Describe the full user experience for this feature. Also define the metrics by
which we can measure success/failure for the user.

"Must have" functionality

Highlight any "must have" needs and functionality for the request.

This should not be a full list of functionality; the Carbon team will work with
you to define functionality based on the desired UX.

Specific timeline issues / requests

Do you want this work within a specific time period? Is it related to an
upcoming release?

NB: The Carbon team will try to work with your timeline, but it's not
guaranteed. The earlier you make a request in advance of a desired delivery
date, the better!

Available extra resources

What resources do you have to assist this effort?

Carbon is a collaborative system. We encourage teams to build components and
submit them for integration as either add-ons or core components.

[tay1orjones]

In #11230 an onKeyUp prop handler was added and can be used to validate/restrict the component to input integers-only. Let us know if this doesn't work for you.