[FEATURE] Serialize and deserialize message as/from json

[Hadatko]

Is your feature request related to a problem? Please describe.

I am struggling with one issue where this could be handy. Just an idea. Lets say we have mqtt broker. One connection can be C code where eRPC could serialize data as json. On other side there will be python code which would read and parse json...

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• [X] I checked if there is no related issue opened/closed.
• [X] I checked that there doesn't exist opened PR which is solving this issue.

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