Parallel upload of blobs to walrus

[giac-mysten]

This feature would allow to speed up publishing and updating a site.

The implementation should take care that gas and payment coins do not get locked by the competing uploads.
This may require updating the walrus binary to accept a gas coin as an argument.

Parallel upload of blobs to walrus · Issue #169 · MystenLabs/walrus-sites

[Tzal3x]

Should the upload be atomic? Meaning that if an upload of a file fails, the site should be deleted?

[giac-mysten]

Should the upload be atomic? Meaning that if an upload of a file fails, the site should be deleted?

The site is not created until all the blobs are uploaded, currently. So the problem should not arise.