Update token validation to use tc-core-library-js v2.1 instead

[mtwomey]

It's using something internal right now, need to use this lib instead.

[gondzo]

@mtwomey done in #3
before merging to dev, we need to:
create a token for tc-project-service and tc-message-service and update their config.busApiToken with the new tokens. same goes for deploying to prod