Cherry-pick changes from `develop` -> `main`

[baziorek]

Probably there were never full merge develop -> main, that is why it is that hard to do its now (I tried: https://github.com/hyperledger/iroha-python/pull/121). That is why instead of merge I'm just cherry-picking changes from develop to main branch.

---

In develop branch was committed PR:

1. https://github.com/hyperledger/iroha-python/pull/104 - serious problem fixed with python files generated by too new protobuf
2. https://github.com/hyperledger/iroha-python/pull/103 - small examples refactoring + added new example made by @iptelephony .
3. https://github.com/hyperledger/iroha-python/pull/107 - serious refactoring of examples + added two more examples
4. Added auto-restart to iroha: https://github.com/hyperledger/iroha-python/pull/122/commits/6781449d8081c0cdab80dc57a38f418734e109e1

   ---

   In order to make its working in also Ubuntu 18.04 and Ubuntu 20.04 I needed to:

5. edit file: setup.py (requirements for versions only)
6. do the same as https://github.com/hyperledger/iroha-python/pull/104 but in Ubuntu 20.04 (but it also works in Ubuntu 22.04 now)

[baziorek]

I prepaired Dockerfile to allow easy-testing in various systems: https://gist.github.com/baziorek/490fe77786a32fc32f8295b5968a4d1a

---

Tested for (with the docker above):

• [x] Ubuntu 18.04 - works perfect
• [x] Ubuntu 20.04 - works perfect
• [x] Ubuntu 22.04 - works perfect
• [x] Manjaro 20220807 - works perfect

  ---

  Commands to reproduce tests with the dockerfile:

  docker build . --build-arg 'SYSTEM=ubuntu' --build-arg 'SYSTEM_VERSION=18.04'  --build-arg 'IROHA_REPOSITORY_OWNER=baziorek' --tag iroha-python-test:ubuntu_18.04
  docker build . --build-arg 'SYSTEM=ubuntu' --build-arg 'SYSTEM_VERSION=20.04'  --build-arg 'IROHA_REPOSITORY_OWNER=baziorek' --tag iroha-python-test:ubuntu_20.04
  docker build . --build-arg 'SYSTEM=ubuntu' --build-arg 'SYSTEM_VERSION=22.04'  --build-arg 'IROHA_REPOSITORY_OWNER=baziorek' --tag iroha-python-test:ubuntu_22.04
  docker build . --build-arg 'SYSTEM=manjarolinux/base' --build-arg 'SYSTEM_VERSION=20220807' --build-arg 'IROHA_REPOSITORY_OWNER=baziorek' --tag iroha-python-test:manjaro_20220807

[baziorek]

@appetrosyan Thanks for Your review. I've corrected what You suggested in 2 commits:

• b36447fc3002b2d8b7617591a3363021126a443f
• 6736989e22f29577f70f77ec24fecf918f7051a5