Migrate Statistics Realtime SDK API spec to MDX

[GregHolmes]

Description

This PR converts the Realtime SDK Statistics API reference page from Textile format to MDX, as part of a full textile to MDX migration.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch EDU-2046-Convert-Pub-Sub-JavaScript-API-refs-to-MDX

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[m-hulbert]

These are going to be painful to review, but thanks for getting the ball rolling!

[m-hulbert]

I think these should all have the order changed to:

Paramater | Description | Type | Default |

We may even want to role the default into the description if it saves room / is simple.

[GregHolmes]

I don't think the first table needs a default. But I've rearranged all of this for the second table.

[franrob-projects]

Nothing, Mark hasn't commented. Apporved