Summary

Need to decoding of the existing "collabs" metadata field with the latest spec.

Description

All the underlying changes does not need to support backwards compatibility, just need to make a subsequent updates.

• Rename "collabs" field to "collaborators"
• Update the Collaborators type to be a Collaborators(Vec<CatalystId>) and change the existing decoding and encoding logic.
• Add corresponding decoding.rs test cases