Add dynamic-properties as python script arg

Add dynamic-properties as python script arg

For the remote python executor, we have the ability to provide
dynamic properties, that will end up marshall as Json. Through
the gRPC session, it will be transform to a Google Proto Struct.
Once in the remote python executor, we use utility method from
Proto to convert the Struct into a Json string, and we pass it
as the last argument of the script execution. That way, user can
access them in their script, simply by loading the content using
json.loads and then interact with the data through the python dict.

Change-Id: Ib3552c06734aed252ec28f47173bc8668afe085d
Issue-ID: CCSDK-1606
Signed-off-by: Alexis de Talhouët <adetalhouet89@gmail.com>