Add configuration option to enable or disable foreign keys check for all 4 types of database connections #883
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Problem:
When defining migrations for SQLite and, for example, setting cascading on delete it dosn't work as foreign keys are not enabled. According to documentations https://www.sqlite.org/foreignkeys.html they should be enabled manually.
Solution:
To not rely on changes how DBMS handles that now and in the future, developer not can enable / disable foreign keys in database connection explicitly. That now would be possible for all 4 types of database.