[Doc] Add doc of OAuth2 authentication for Node.js client

[momo-jun]

What issue do you find in Pulsar docs?

File an issue here for the required doc effort.

Pulsar client node version 1.6 is about to release with the node.js client support of OAuth 2.0. See apache/pulsar-client-node#190 for more details.

What is your suggestion?

Add content for node.js client in the following OAuth 2.0 topic.
https://pulsar.apache.org/docs/en/security-oauth2/

Do you have any references?

apache/pulsar-client-node#190
https://github.com/streamnative/examples/pull/92/files
https://github.com/streamnative/doc-cloud/pull/130/files

Would you like to fix this issue?

Sure, I'd love to.

Note

• I have researched my question.

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