Enhancement: Add support for ?any? column types (e.g. json)

[Ninos]

Covert values before/after encryption/decrytion by using doctrine internal converter.

PS: I've tested it with json as field, should also work with all others (object, array, simple_array, ...)

[mogilvie]

Thankyou for the pull request. I will look to do this in V4 over the next week or two.