support jsonl encoder option

[imishinist]

To support jsonl in usql, we added support for jsonl format to tblfmt.

[kenshaw]

@imishinist I appreciate the work on this. Can you tell me what the specific use for this would be? I wrote tblfmt primarily because of usql, but note that usql has JSON output (it just uses the standard library).

My concern here is that the JSON standard is actually much more complicated than most people realize, especially with regards to character/UTF8 encodings.

[jduhamel]

@kenshaw Just wanted to let you know that it's really a great option. I use this a bunch with usql, added jsonl as a print format.

One of the big problems with json as a output is that it doesn't print a newline after the record so many JSON tools can get overwhelmed with a decent sized table. jsonl makes it far more tractable.

I wish I could have figured out to have the json format add a NL after the recordsep, (I can see it in there just wans't sure how to set it)