Add node package

[t00ts]

Describe what you want implemented
Create and publish a js-compatible dusk-protobuf module to our node package registry that exposes Rusk services.

Describe "Why" this is needed
Currently, the browser extension proto files are updated manually. This is cumbersome and can easily lead to human errors.

Describe alternatives you've considered
Enhancing the pre-build scripts of the extension.

Additional context
N/A