Store and report results for test trace

[andrey-kuprianov]

This is the follow-up issue for #27 (and PR #61), which implement the basic functionality of producing and executing Pytest tests from traces.

The task of this issue is, during the execution or upon finishing of testing the current trace, to retrieve and store in reports folder, under the name that corresponds to the test being executed:

• full transaction data for each submitted transaction
• results of executing the transaction
• node logs
• full Pytest output

The user might be given an option to either store the above results for all, or only for failed tests. This is a nice-to-have, and not required.