Support ndjson with a codec

[dlvenable]

Is your feature request related to a problem? Please describe.

The current json codec supports parsing JSON arrays. However, many users would like to parse ndjson formatted files.

{"key": "value1"}
{"key": "value2"}
{"key": "value3"}
{"key": "value4"}

Describe the solution you'd like

Create a new codec: ndjson.

Describe alternatives you've considered (Optional)

We can already ready nd-json files using a combination of:

• Parsing with the newline codec.
• Using the parse_json processor.

[dlvenable]

Additionally, we have seen a number of situations where JSON objects are not always properly separated by a newline.

I believe we can implement this codec to have a loose enforcement of different objects by default. Thus allowing for parsing the following:

{"key": "value1"}
{"key": "value2"}{"key": "value3"}
{"key": "value4"} {"key": "value5"}
{"key": "value6"}

{"key": "value7"}

This would produce seven events.

This change would also provide something that isn't currently possible with the newline codec and parse_json combination.