Add support for Verifiable Credentials Data Model v2.0

[parviz-mv]

VC Data Model v2.0 introduces new contexts:

"https://www.w3.org/ns/credentials/v2",
"https://www.w3.org/ns/credentials/examples/v2"

When I try to issue a credential with a new contexts:

const credential = {
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://www.w3.org/ns/credentials/examples/v2",
  ],
  id: "https://example.com/credentials/1872",
  type: ["VerifiableCredential", "AlumniCredential"],
  issuer: "https://example.edu/issuers/565049",
  validFrom: date.toISOString(),
  validUntil: untildate.toISOString(),
  credentialSubject: {
    id: "did:example:ebfeb1f712ebc6f1c276e12ec21",
    alumniOf: "Example University",
  },
};
const verifiableCredential = await vc.issue({
  credential,
  suite,
  documentLoader,
});

I got an error:

Error: "https://www.w3.org/2018/credentials/v1" needs to be first in the list of contexts.

Also, if I use v1 contexts with a new validFrom and validUntil properties, credential successfully issued, but contains issuanceDate property which was renamed to validFrom in v2.0 spec:

{
  '@context': [
    'https://www.w3.org/2018/credentials/v1',
    'https://www.w3.org/2018/credentials/examples/v1'
  ],
  id: 'https://example.com/credentials/1872',
  type: [ 'VerifiableCredential', 'AlumniCredential' ],
  issuer: 'https://example.edu/issuers/565049',
  validFrom: '2023-08-11T10:07:34.116Z',
  validUntil: '2023-08-11T10:09:34.116Z',
  credentialSubject: {
    id: 'did:example:ebfeb1f712ebc6f1c276e12ec21',
    alumniOf: 'Example University'
  },
  issuanceDate: '2023-08-11T10:07:34Z',
  proof: {
    type: 'Ed25519Signature2020',
    created: '2023-08-11T10:07:34Z',
    verificationMethod: 'did:example:1234#z6MknsvN6TxRX8WQ3tC1MToBp9Wc6EX2jCYnVTnkNcXrDCg3',
    proofPurpose: 'assertionMethod',
    proofValue: 'z3m5SNbh5PGn7LYv2mZKLwNvyGKpV6mSytuDdWF4Xziv1pfkUNpiGFiRjTwRxX9kXR3LNshUnRM3tieBP3meqGAry'
  }
}

[JSAssassin]

@parviz-mv Support for Verifiable Credentials (VC) Data Model 2.0 is currently under development. You can find the ongoing work in this PR: #148

[parviz-mv]

@JSAssassin Got it, thanks!