Generate TypeScript type definitions from JSON schema

[aiwilliams]

There are types in the integration-sdk coded to reflect the types defined by the schemas in this repository. Likely other projects are doing something similar.

It would be ideal to have a package, born out of this repo, that provides TypeScript type definitions for the schemas of the data model. This project is already shipping as an NPM module, so it is convenient to include the generated types in that package.