HLD: API for number-text and date-text table columns

[jattasNI]

Pull Request

🤨 Rationale

Need APIs for #1011 and #1014. Builds on #1224.

👩‍💻 Implementation

Updates to existing HLD. Philosophy is to rely on the browser's Intl formatting APIs when possible and to provide modes with opinionanted configuration and with custom configuration.

🧪 Testing

N/A

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[msmithNI]

Mostly looks good to me. Approving but assuming these updates will be made:

• removing locale from API, and instead stating it'll be looked up from lang/locale on the theme provider
• placeholder being shown for date columns when the value is null

[jattasNI]

@mollykreis @atmgrifter00 @rajsite heads up that I've responded to the last open comment threads so this is ready for your next round of review.