Dependency on internal Twitter libraries

[guibaq]

Some scripts depend on internal Twitter libraries (e.g., here). Please provide instruction on how to install them.

[no-identd]

See also twitter/the-algorithm#907

[jjh42]

The intention with this release was to make sure you can run the for you heavy ranker and the twhin embedding model. These should be runnable (instructions in README), there are some shared libraries which might contain other code paths (e.g. for experimental work not currently in use) that aren't intended to be run.