Dumping array/json to jsonlines

[algorri94]

Issue Description

• Description of the issue:
  When dumping to jsonlines files in S3 from Postgres, whether it's an array or a json column, the field is written as a string:

{
    "psql_array": "{\"a\", \"b\", \"c\"}",
    "psql_json": "[\"a\", \"b\", \"c\"]"
}

• Sling version (sling --version):
  1.2.24

• Operating System (linux, mac, windows):
  linux, using official docker image slingdata/sling

[flarco]

fixed for next release