Add tests that check the consistency of the restored schema

[rocket-3]

The tests that we have now, rely on no exception thrown aspect when executing sequence of dbgit commands

Databasegit application fails to exception in most cases, but most cases are not enough to make sure it isn't broken after some changes made to its code

Sakilla schema restore test (DbGitIntegrationTestBasic#dbToDbRestoreWorksWithCustomTypes) is a good candidate to enable checking of consistency cause it uses source and target sakilla database (the most complicated) and we can perform equality check of these databases somehow.