Oauth for SchemaRegistry

[toanvc]

Hi, currently I'm seeing that we only support the basic auth for SchemaRegistry, with username/password. I wonder if there is another way to get Oauth bear token like kafkajs has for broker authentication?

https://kafka.js.org/docs/configuration#oauthbearer-example

 SchemaRegistry({
      auth: {
        username: username,
        password: password
      },
      host: host
    })

[stalbot15]

Would love to have this functionality, as we run schema registry with oauth and wish to support nodejs clients. Is it possible to promote this PR into a release? Or is there some other workaround with existing releases?