Support array operations

[isovector]

I'd like access to the <@ operator as described here https://www.postgresql.org/docs/current/functions-array.html

[shane-circuithub]

This probably isn't something we're going to get around to any time soon, but in the mean time you can do this:

(<@) :: Sql DBEq a => Expr [a] -> Expr [a] -> Expr Bool
(<@) = binaryOperator "<@"