Remove dependency on tsickle

There is still a compile-time dependency, so to avoid users having to install tsickle,
this depends on shipping a JS distro of @bazel/typescript on npm

Closes #260

PiperOrigin-RevId: 209859448
2 files changed
tree: fcb01a57f104afa6fa4d7f016e3496ab0f56d942
  1. third_party/