Dedicated Bifrost NPM package to consolidate dependencies

[ccmcintyre-kingsds]

At present, Bifrost introduces various Node.js package dependencies to the directory or project it is initialized in, including calling npm init and generating a package.json, package-lock.json, and node_modules in the working directory as necessary, or adding and installing its dependencies to the existing ones if already present. The exact dependencies, and versions thereof, will vary based on the environment (Node.js version, platform, whether DCP is being used, etc), and the details are not especially transparent to the user. All these decisions and actions are made via npm processes that are started by Bifrost internally during intialization.

As suggested by @wesgarland, a much stronger organizational approach is to have a single explicit js dependency, that points to a NPM module created by us, and which can serve as the consolidated point for coordinating Bifrost's Node.js dependencies, in a way that will be both more clear to the user, and simultaneously less disruptive.

[wesgarland]

Suggested package name: pyjs-bifrost