Implement Metadata as per DID Spec

[arnabghose997]

The metadata has been implemented, having the fields required as per the DID Spec.

Following is the current Format of DID Doc:

{
   "didDoc":{
      "did":{
         "context":[
            "https://www.w3.org/ns/did/v1",
            "https://w3id.org/security/v1",
            "https://schema.org",
            "something.com",
            "whatelse.com",
            "hypersign.id"
         ],
         "id":"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52",
         "controller":[
            "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52",
            "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c51",
            "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c53"
         ],
         "alsoKnownAs":[
            "did:hs:1f49341a-de30993e6c52"
         ],
         "verificationMethod":[
            {
               "id":"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4",
               "type":"Ed25519VerificationKey2020",
               "controller":"did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52",
               "publicKeyMultibase":"z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4"
            }
         ],
         "authentication":[
            "did:hs:0f49341a-20ef-43d1-bc93-de30993e6c52#z8BXg2zjwBRTrjPs7uCnkFBKrL9bPD14HxEJMENxm3CJ4"
         ],
         "assertionMethod":[
            
         ],
         "keyAgreement":[
            
         ],
         "capabilityInvocation":[
            
         ],
         "capabilityDelegation":[
            
         ],
         "service":[
            
         ]
      },
      "metadata":{
         "created":"2022-02-21T12:16:53Z",
         "updated":"2022-02-21T12:17:11Z",
         "deactivated":false,
         "versionId":"FdIDvU4MiuYtYP0slhJ+hIYVybtzWL8qrCWyLnp3/iA="
      }
   }
}