Function parseKeyVaultKeyIdentifier

Parses the given Key Vault Key Id. An example is:

https://.vault.azure.net/keys//

On parsing the above Id, this function returns:

  {
     sourceId: "https://<keyvault-name>.vault.azure.net/keys/<key-name>/<unique-version-id>",
     vaultUrl: "https://<keyvault-name>.vault.azure.net",
     version: "<unique-version-id>",
     name: "<key-name>"
  }