Proof of concept to support number interpolations in RN. Refs #1543

[badsyntax]

What:

This is just a POC for issue #1543. I'd be happy to close.

Why:

How:

Checklist:

• [ ] Documentation
• [ ] Tests
• [ ] Code complete
• [ ] Changeset

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Latest commit: 617d4fe5a966e347c7bdfa8d3dd82ee601d4303d

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[badsyntax]

We need https://github.com/lelandrichardson/react-primitives/pull/148 merged before we can support RNW 0.18 in order to fix the number interpolation issue.