QUICKFIX: Coordinate Mediation V3

[radleylewis]

Coordinate Mediation Enhancements

This PR implements some minor refactoring and best practices with respect to the did-comm protocol (specifically coordinate mediation)

What is being changed

The PR:

• FIX: correctly exports the coordinate mediation manager v3 from the package (and addresses naming conflicts with v2 exports)
• ensures consistent naming for differentiation of Version 2 Coordinate Mediation Specification and Version 3
• introduces better error handling on the mediate cli (directs to setup instructions in mediation agent)
• updates the mediation-manager README for more descriptive instructions on setup (both programatically and through the agent.yml)
• adds documentation/notes in code for easier consumption by developers

Quality

Check all that apply:

• I want these changes to be integrated
• I successfully ran pnpm i, pnpm build, pnpm test, pnpm test:browser locally.
• I allow my PR to be updated by the reviewers (to speed up the review process).
• I added unit tests.
• I added integration tests.
• I did not add automated tests because _________, and I am aware that a PR without tests will likely get rejected.

[mirceanis]

Looks great!