Unify argument parsing across tests and examples to avoid code duplication

[pbelevich]

Subtask of #299

[acforvs]

Hi @pbelevich!

I would love to address this issue if possible. Will it be enough to simply create a default parser with a similar set of arguments and put it to the utils, for example? Thanks!

[kwen2501]

Yes, please! You are so much welcome to pull a PR!

[acforvs]

Hi @kwen2501,

I made a PR, signed the agreement, but the bot doesn't seem to recognise it. Could you take a look please?

upd: everything's ok now