Avoid double serialization/deserialization of the commands/ responses

Right now we are :

* double serializing/deserializing data in dual communication
* deserialize twice the command in unity app, first with the purpose of identifying command type, and second to deserialize command parameters in a strong typed object.

* deserialize once the command in proxy to figure out routing to the correct client.

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_{You can find the original issue from GitLab [here](https://gitlab.com/altom/altunity/altunitytester/-/issues/706).}