MDX: Support CSF3 play/render functions

[shilman]

Issue: #15762

What I did

Added CSF3's play/render functions to MDX:

<Meta render={(args) => <Button {...args} />
<Story name="Foo" render={(args) => <Button {...args} />
<Story name="Foo" play={() => console.log('play')} />

The MDX compiler still compiles to CSF2, which also supports these functions. I'm planning to migrate the compiler to output CSF3 once MDX v2 stabilizes and it's time to revisit all this.

@jonniebigodes we should talk about documentation updates for this when you have time!

How to test

• See attached snapshot tests
• See attached e2e test in official-storybook

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[tmeasday]

LGTM