[feature] refactor and improve codegen

Simplify code generation and implement deserialization for objects coming from rust.

Signed-off-by: Artemii Gerasimovich <[email protected]>

Author: Artemii Gerasimovich

.github/workflows/iroha2-pr.yml

@@ -72,5 +72,5 @@ jobs:
         run: |
           docker-compose up -d && sleep 5
           docker run --net example_default -v $PWD:/test iroha:python-test \
-              timeout 3 python3 test.py ||
+              timeout 5 python3 test.py ||
               (docker-compose logs && false)