Fix B.3 Representation: Ed25519Signature2020 test vectors

[filip26]

Adds missing @context https://w3id.org/security/suites/ed25519-2020/v1 to Ed25519Signature2020 test vectors. Proof canonical form, hash, and signature are re-computed.

It's related to, but does not close, issue #75

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[w3cbot]

iherman marked as non substantive for IPR from ash-nazg.

[msporny]

@filip26, thanks for the PR -- do you know if these updates align w/ other implementations (I imagine they do since you're passing the test suite?)

@Wind4Greg, what's going on with these test vectors? Are these updates correct?

[filip26]

@msporny Without a proper Ed25519Signature2020 context, the proof is expanded with using of example context, e.g. https://www.w3.org/ns/credentials/examples#Ed25519Signature202 instead of https://w3id.org/security#Ed25519Signature2020. This PR fixes that.

I expect no issues for other implementations, on the contrary, without the right context, the result using example context is not verifiable, i.e. a proof type is unknown to a verifier.

[Wind4Greg]

Thanks @filip26 and @msporny! Let me update my test vector code and see if I can confirm. Cheers Greg

[Wind4Greg]

Verified these against my vectors. Thanks @filip26!

[dlongley]

Thanks! This looks like what I asked for in #75. I haven't checked this against our implementation but it definitely looks better.