Add typescript to client to satisfy node-ts peer dep

[interfect]

This fixes #70 by adding a dependency that will pull in typescript, which node-ts demands as a peer dependency but can't install itself.

The version comes from what node-ts currently requires.

[OmgImAlexis]

This should be closed, ts-node should only be used for development. There's no reason to include it in the actual deps especially when it looks like ts-node isn't even used here. https://github.com/codechecks/monorepo/issues/85