Tzatziki new DB Module

[alexandrepa]

I create this discussion regarding the issue #385 and db module proposal on the wiki : https://github.com/Decathlon/tzatziki/wiki/Tzatziki-DB-Module

The idea of this discussion is to determine the approach we want to use about dividing the different db modules.

[alexandrepa]

In my opinion, the pure SQL module should defined steps that are different from existing tzatziki spring jpa module to not have breaking changes. It means that we need to add a new syntax to insert and assert in pure sql.

Ideally for me, the pure SQL module could also integrate all the cleaning logic of the tables between tests. So the tzatziki jpa module can import this pure SQL module to use the cleaning logic.