Add DBAL for (some) json functions

[c33s]

it would really make a great DX (developer experience) if we would have some kind of DBAL for all this different json functions. this would be awesome.

it can happen that test databases are sqlite but staging and production are postgresql.

i made an ugly hack to achieved this https://gist.github.com/c33s/979564811ce611a47f5d157d0d62528a but i would love to see such functions integrated in this package.