Improve the loading of the libraries interface

[ktarasenko]

Is your feature request related to a problem? Please describe.
Libraries are too big to be in the db, how should they be provided to the workflow lib if not from the engine - the API at the moment is not thought-through.
Update the design doc with the results.

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[Tarun-Bhardwaj]

@ktarasenko, has development started for this issue?

[fredhersch]

@jingtang10 has this work started?