Move the ts config out of the root of the repo to the packages
themselves. This is because no new typescript development is planned
for the monorepo itself, new typescript lives in the ecosystem monorepo,
see https://github.com/ethereum-optimism/ecosystem. It may also live in
the monitoring monorepo, see https://github.com/ethereum-optimism/monitorism.

This will make porting the individual ts packages out of the monorepo
more simple and also cleans up the root of the monorepo, reducing the
overhead for contributors.