Wip range download

[rklaehn]

Description

Add some more ops related to range requests to iroh for a demo

Notes & open questions

1. This is far from being ready to merge in terms of quality
2. We need to make sure the blob api does not become a giant list of stuff somebody at some point found useful, but a consistent API.

Change checklist

• Self-review.
• Documentation updates if relevant.
• Tests if relevant.

[rklaehn]

First part:

❯ cargo run blob local-ranges --hash 17c8e5a70f69d289105553dfa762064e8cc57ffb9355d76508f557e37ef051db
0..97657

❯ printf "\x00" | dd bs=1 seek=100000 count=1 of=$APP_HOME/iroh/blobs.v1/complete/17c8e5a70f69d289105553dfa762064e8cc57ffb9355d76508f557e37ef051db.data conv=notrunc 

❯ cargo run blob local-ranges --hash 17c8e5a70f69d289105553dfa762064e8cc57ffb9355d76508f557e37ef051db     
0..96
112..97657

these are chunk ranges, so writing 0x00 at offset 100000 damaged chunk 97, so chunk group 96..112.

[rklaehn]

Second part:

cargo run -- blob download-ranges --bytes 1..100 <ticket>