Integrate quickstart examples into integration tests

[hudi-bot]

• create integration test suite for quickstart examples
• make the code examples on website pages generated from the code

JIRA info

• Link: https://issues.apache.org/jira/browse/HUDI-3309
• Type: Task
• Epic: https://issues.apache.org/jira/browse/HUDI-7536
• Fix version(s):
  • 0.16.0