decompress jsonl in jsonl reader / filesystem

[rudolfix]

Which source is this for
filesysten

Describe the data you'd like, be specific, link the docs
filesystem contains a helper (transformer) to read jsonl files (readers.py). please add an option to unzip compressed files

1. if the file extension is gz, apply decompression automatically (you have the file path in FileItem)
2. also provide an option to override that behavior, (ie. decompress with true/false/auto)

[IlyaFaer]

The issue requires this core PR to be merged first
Just a minor change and a test case will be required after that

[rudolfix]

@IlyaFaer yeah stuff is merged and stuff is unzipped automatically, closing