Many additions and fixes to kli commands, new ESSR payload attachment support

[pfeairheller]

This PR includes:

• New mailbox commands for using bespoke mailbox services
• Add support for BigPathedMaterialGroup to support large (> 4k) forwarded attachments.
• Add witness code authentication to rotate and delegate confirm
• Improvements to kli commands mailbox add and witness authenticate to work in all cases (like delegated AIDs).
• New kli aid command for printing the AID of an alias (useful in scripts).
• Added --delpre as a command line argument to kli icncept (useful in scripts).
• Fix for witness publisher to account for multiple events in one cue'ed message.
• Added support for witness auth codes for delegated AIDs.
• Removed logging messages in the INFO case for escrow reprocessing.