feat(credential-w3c): added support bbs proof format

[veromassera]

What is being changed

This PR extends the credential-w3c actionHandler logic by adding support for bbs signatures.
In this way, it will be possible to generate plugins that implement the creation of Verifiable Credentials and Verifiable Presentations, as well as their verification using bbs-type signatures.

According to what was discussed here:
https://discord.com/channels/878293684620234752/1220477267172659360/1227352488579961003

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.

Details

These changes only extend the logic of the action-handler, they do not include the implementation of the plugin.