add did:oyd support

[fabianekc]

What is being changed

This is an initial PR to add did:oyd support to Veramo.

Quality

Check all that apply:

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

Details

Right now this PR only provides the implementation and tests for creating new DIDs. I'm happy to also add support for updating and deactivation when the initial PR is accepted.

[fabianekc]

Thanks for reviewing the PR. Let me know if anything else is needed!