updating KT & JS for JAR

[EbonyLouis]

Changes

Based on this discussion:

• KCC-Wallet: Decodes JAR, Verify the JWT, decode its payload & Process SIOP Request
• KCC Issuer: Signs the SIOPv2 Auth Request and sends back in JAR format
• Updated DID naming

Question / Issue

In order to sign the SIOPv2 Auth Request in Kotlin, it needs to be a JwtClaimsSet before signing. Is this okay to do or should we update Kotlin so we can sign the Auth Request when it's a JSON object ? However, it is allowed in JS. To keep it uniformed this is how its currently being done in this PR: (@KendallWeihe , @decentralgabe , @frankhinek , @tomdaffurn )

  // Sign the SIOPv2 Auth Request
  const siopRequestJwtPayload = {
    sub: issuerBearerDid.uri, // Issuer's Decentralized Identifier string
    iss: issuerBearerDid.uri, // Issuer's Decentralized Identifier string
    iat: Math.floor(Date.now() / 1000), // Issued at
    exp: Math.floor(Date.now() / 1000) + 86400, // Expiration time
    request: siopRequestPayload, // Embed the SIOP request payload 
  };

  try {
    const jwtToken = await Jwt.sign({
      signerDid: issuerBearerDid, 
      payload: siopRequestJwtPayload,
    });
  // Send the SIOPv2 Auth Request in JAR format 
    const queryString = `client_id=${encodeURIComponent(issuerBearerDid.uri)}&request=${encodeURIComponent(jwtToken)}`;
    res.send(queryString);

TO DO:

• update KCC-Wallet-Swift, we need to update web5-swift on docs site first since JWT.verify() was introduced 2 weeks ago.

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