Changes required to support the latest EM Compositon on psnlv

[ddelpiano]

• Changes suggested by Katrine to support the EMComposition viewer wise
• grpc from psyneulink are an old version and the viewer uses a more recent version causing a conflict, since these are not used anymore we commented the import (I can do a clean up later if this is fine).

[kmantel]

Hi, I think the changes in #3218 should fix the EMComposition in a more general way than what I gave you before, specifically this change: https://github.com/PrincetonUniversity/PsyNeuLink/pull/3218/files#diff-c671c021254f77d644246afac5244674ac47f284228d2942c97bcd5fde82c662

Parameters labeled as pnl_internal or not bypassed this problem, but this labeling should be more of a superficial difference that I think shouldn't matter for what you need.

[ddelpiano]

Thanks @kmantel , should close this then?

[kmantel]

@ddelpiano they don't affect anything related to RPC, which I see is included here. Do we need to upgrade the protobuf (?) package or remove the psyneulink rpc module?