migrations; new test showing it is working with external transformers runs
properly when migrations were manually performed but still need
to test automated migration management
towards generic method polling and reposito;y; config settings to
filterevents/methods by account address; refactoring some stuff out of
repo and into converter; remove fetcher and instead call
blockchain's FetchContractData directly; finishing tests
* Separate Repository into multiple Repositories
* Use struct scan for transactions
* Use struct scan for blocks
* Remove unused block repo methods
* Update naming
* Rename / Cleanup repository related fields
