feat(credential-w3c): list usable proof formats for an IIdentifier

[mirceanis]

What is being changed

The CredentialPlugin now exports a new method listUsableProofFormats() that can be used to decide which type of proofFormat can be requested for creating a credential or presentation.
It queries the other available credential plugins to check if the keys of a DID are usable with them and also relies on the metadata provided by key management systems in its decision.

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.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (93198bc) 84.99% compared to head (acc40e4) 84.99%.
Report is 4 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1268      +/-   ##
==========================================
- Coverage   84.99%   84.99%   -0.01%     
==========================================
  Files         167      167              
  Lines       18001    18137     +136     
  Branches     2009     2039      +30     
==========================================
+ Hits        15300    15415     +115     
- Misses       2701     2722      +21     

Files	Coverage Δ
packages/core/src/agent.ts	99.25% <100.00%> (ø)
...es/credential-eip712/src/agent/CredentialEIP712.ts	91.68% <100.00%> (+0.36%)	⬆️
packages/credential-ld/src/action-handler.ts	89.58% <100.00%> (+0.99%)	⬆️
packages/credential-ld/src/types.ts	100.00% <100.00%> (ø)
packages/credential-w3c/src/action-handler.ts	83.18% <96.00%> (+1.18%)	⬆️

... and 10 files with indirect coverage changes

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[nickreynolds]

looks great