Blobs

[iAmMichaelConnor]

All things blobs

Background on blobs: https://github.com/AztecProtocol/engineering-designs/pull/21/files

[MirandaWood]

Is this maybe a dupe or extension of #8955?

[iAmMichaelConnor]

Whoops. I'll find time to tidy the old one, and then kill this one.

[iAmMichaelConnor]

I've killed the old one (because github just killed tasklists), so will keep this one (and have integrated the open issues from the other one)