Support reading from datasets saved as jsonl

[norberttech]

Currently JSONL is supported only when writing, for symmetry we must add it also to the reader.

When reading jsonl all we need to do is read the json file line by line and, decode each line and turn it into a row that would be yielded after.

DX should be similar to writter:

from_json()->asJsonl()

[norberttech]

Reference to #1442 for inspiration

[norberttech]

@jmortlock would you be interested in picking up this one?

[jmortlock]

Sure thing i'll work on adding read support

[norberttech]

Awesome! Let me know if you would need any assistance 💪