In this PR, we consolidate TypeScript config files (using the 'include' setting) and JS test directory naming. The goal is to reduce the number of processed files during different build steps.
In order to ease the identification of private packages within the monorepo, this adds an `internal-` prefix to all of the current private packages. This makes it immediately clear when reviewing `packages/js` what is and isn't a private package.
Vladimir Reznichenko
Sam Seay
Christopher Allford