refactor(core): separate prefix from address in agent info

[jrriehl]

Proposed Changes

Changing the field address to identifier in AgentInfo breaks the local agent inspector, so since this is not actually needed for the updated almanac attestation, let's simply add prefix as a new field to the AgentInfo model instead.

Linked Issues

[if applicable, add links to issues resolved by this PR]

Types of changes

What type of change does this pull request make (put an x in the boxes that apply)?

• Bug fix (non-breaking change that fixes an issue).
• New feature added (non-breaking change that adds functionality).
• Breaking change (fix or feature that would cause existing functionality to stop working as expected).
• Documentation update.
• Something else (e.g., tests, scripts, example, deployment, infrastructure).

Checklist

Put an x in the boxes that apply:

• I have read the CONTRIBUTING guide
• Checks and tests pass locally

If applicable

• I have added tests that prove my fix is effective or that my feature works
• I have added/updated the documentation (executed the script in python/scripts/generate_api_docs.py)

[dominic22]

cool lgtm!

[Archento]

LGTM!