allow credential definition tagging

[burdettadam]

If you create a credential definition in one agent, write it to the ledger, open up a new agent, and try to create a credential definition using the same did as in the previous agent, it will fail. Credentials definitions have tags to allow an agent to create multiple credential definitions for a single schema.

As a client, when creating a new credential definition I would be able to provide a tag that will allow me to create a new definition using the same Did and schema I have before.

[burdettadam]

The aca-py agent seems to be using the schema name concatenated with underscore and version as the tag. For example S7hnXWugEPiF1x31hhQFMm:3:CL:83755:tedtested_3.3 which follows "{DID}:{MARKER}:{SIGNATURE_TYPE}:{SCHEMA_SEQ_NO}:{TAG}" pattern.

Creating multiple credential definitions in the same aca-py issuer will produce multiple credential definition listings. It is not clear if keys are being rotated by aca-py, if they are, as a client I would not expect to be able to issue credentials with the outdated credential definitions.