oauth middleware for agent

[namhoang1604]

Description

Implement OAuth middleware to enable secure authentication and authorization for API endpoints. This middleware will streamline the authentication process, and handle access token verification.

To accomplish this, the following tasks need to be completed:

1. Implement Oauth middleware plugin: build the plugin that can integrate with the agent configuration and validate the token when the request comes. Reference documents: https://github.com/auth0/node-oauth2-jwt-bearer, https://auth0.com/
2. Document the implementation and usage
3. Write the unit test