Add step param to Number

[hannahblair]

Description

Adds a step param to the Number component so we can define the interval at which the input value increases or decreases with the HTML up/down arrows.

Demo:

import gradio as gr

with gr.Blocks() as demo:
    gr.Number(maximum=50, label="Number", steps=10)

demo.launch()

Closes: #4737

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🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/app	minor
@gradio/form	minor
gradio	minor

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With the following changelog entry.

Add step param to Number

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All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-5047-all-demos

---

You can install the changes in this PR by running:

pip install https://gradio-builds.s3.amazonaws.com/2f9d6add4a06a16cdff335777433d858d95e1c34/gradio-3.39.0-py3-none-any.whl

[abidlabs]

Works great @hannahblair! Tested by itself and along with minimum and maximum. The behavior when using minimum and maximum is that the steps start from minimum, which is fine. I tried to include this in the docstring (feel free to trim if its too long)

Some small nits, otherwise LGTM