GET TAR with format=tar and extract

Implementation	bifrost-gateway	boxo	kubo
Conformance Version	main	main	main
Total	✅5	✅5	✅5
Body	✅1	✅1	✅1
Header Content-Disposition	✅1	✅1	✅1
Header Content-Type	✅1	✅1	✅1
Header Etag	✅1	✅1	✅1
Status code	✅1	✅1	✅1