By default, TypeScript looks for type roots in
parent node_modules directories. We can't
do this because there are React types
that cause errors. This commit explicitly
defines the type roots for the package to avoid
that behavior.
This contains the basic framework for our new `monorepo-merge`
command. The goal will be for this command to handle the heavy lifting
for merging repositories with full history. It will (ideally) bring any
plugin or package into the repository in a ready-to-use state.