Support for JSONL/NDJSON file formats in the object viewer

[kujenga]

Currently, when you try to view a file that ends in the .jsonl extension in the LakeFS object viewer, you get the following error:

lakeFS doesn't know how to render this file (extension = "jsonl", content-type = "application/octet-stream")

It would be great if there was support for rendering information in this format.

Some references:

• Info on this format: https://jsonlines.org/
• Examples of how GitHub renders it: https://github.com/search?q=path%3A%2F%5C.%28jsonl%7Cndjson%29%24%2F&type=code