Primitives Installation

TODO: How to install primitive Python package and which hare assumed fixed dependencies. There are also system packages necessary.

TODO: How to use of extra to define those extra dependencies for fixed dependencies (so that inside our Docker image you install without extra, but outside you use extra).

TODO: Document standard GPU/CPU tenserflow extra.

TODO: Link to primitives installation script in Docker image repository (ideally move it to CLI in the core package).

TODO: How to find primitives to install (Marvin, primitives repository) and then install them. When using pip outside of Docker image.