refactor(shared-data): port shared-data JS source to TypeScript

[mcous]

Overview

This PR converts the JS source of shared-data to TypeScript.

Current status:

• Run flow-to-ts on Flow source
• Fix up errors and formatting weirdness
• Ensure shared-data project is hooked into other TS projects properly

Changelog

• refactor(shared-data): port shared-data JS source to TypeScript

Review requests

Please check carefully for any source-code changes

Risk assessment

Medium, shared-data is pretty important! Please be on the lookup for unintentional source-code changes in the review. This PR should be limited to type and style change only

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (edge@e8f2ae9). Click here to learn what that means.
The diff coverage is n/a.

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[b-cooper]

Awesome 💎

[mcous]

Wanted to call this out because it's a little confusing!

shared-data now has two separate tsconfig files: one for TS, and one for JSON. Having a separate config for JSON allows us to ensure the JSON files are output to lib along with the rest of the .d.ts files, allowing us to use stuff from JSON, like object keys, directly in TypeScript types

[X-sam]