Gist Java SDK

Implement a java sdk (using jdk 17 httpclient) refer to GitHub official doc: https://docs.github.com/en/rest/gists?apiVersion=2026-03-10

Implement the below apis:

• List gists for the authenticated user
• Create a gist
• List public gists
• List starred gists
• Get a gist
• Update a gist
• Delete a gist