Decide serialization format to use for circuits and MPC node communication

[Mikerah]

In MPC, we need a way to serialize and communicate messages between MPC nodes. Further, we need a way to serialize and define circuits. As such, we have several things to decide

• Should we use the same serialization for both circuits and communication?
• Should these be separate?
• Should we use the plain text bristol style mpc circuit format?
• Should we modify the bristol style mpc circuit format to conform to some standard (e.g. json, protobufs, etc)