Add array-type operators

[michalgm]

It would be nice to have operators for postgres array-type fields:
https://www.postgresql.org/docs/9.0/functions-array.html
Incoming PR to add:

• contains (@>)
• contained_by (<@)
• overlap (&&)

[MarcGodard]

I agree to this, this has been causing a lot of issues. I have been storing arrays into json fields, as JSON.stringify, but I cannot query these. Been trying to figure out a way around this and other than storing it as text, then managing it... I cannot seem to find an easy way.