Separate tests into unit and integration directories (#441)

• Introduce unit and integration directories
• Move end_to_end to integration dir
• Split blockchain/verify tests to unit and integration
• Move unit tests to unit dir
• Move money tests to unit directories
• Move wot tests to unit and integration dirs
• Only run unit tests in all Py jobs except 3.11
• membership test: use Membership.__eq__()
• Update end_to_end tests

Close #441 (closed).