* src/vorta/views/extract_dialog.py: Add `ParseThread`, `ExtractTree` and `parse_json_lines`.
* src/vorta/views/extract_dialog.py (ExtractTree.__init__): Adjust signature.
* src/vorta/borg/list_archive.py (BorgListArchiveJob.prepare): Adjust format to
include additional attributes.
* src/vorta/views/archive_tab.py (ArchiveTab): Parse extract data using `ParseThread` and
open `ExtractDialog` afterwards.
* tests/test_archives.py (test_archive_extract): Update tests.
* src/vorta/borg/extract.py (BorgExtractJob.prepare): Adjust signature.
Handling of the data isn't implemented yet.
* tests/test_extract.py
