Export KeyframeSteps from main entrypoint

[danieldelcore]

Makes it so that KeyframeSteps is available via the main entrypoint so the keyframe object passed via indirection/props can be correctly typed

What is this change?

Adds type export for KeyframeSteps

Why are we making this change?

In some cases keyframe step objects are passed via props, so without this it's unable to be correctly typed.

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PR checklist

Don't delete me!

I have...

• Updated or added applicable tests
• Updated the documentation in website/

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Latest commit: b6358f5

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