feat: indicate wrapped lines

[KyleKing]

Attempting to indent each wrapped line for better readability. Can test with:

python -c 'import json; [print(json.dumps({f"{key}": "-" * 30 for key in range(10)})) for _ in range(5)]' | poetry run tail-jsonl

Opened discussion on rich: Textualize/rich#2792

Update: In the meantime, added a string prefix for readability