[jdbc-v2, client-v2] Document using client with SAML/OAuth

## Description

Document and give examples how to configure client to use with SAML/OAuth

Start by locating the client configuration code and any existing authentication documentation or examples in the repository. Document how to configure the client for SAML and OAuth, including examples for each, and consider the work done when both authentication flows are explained clearly.

索引モデルが issue の本文から書いたものです。