Motivation: Review code styles with some bots automatically. Modifications: Set up ReviewDog in GitHub Action to review code style. Add more check rules to checkstyle plugin. Result: Obvious code styles can be reviewed and commented automatically.
* Check license header strictly * Ignore header template * Include more files to check list
Nacos standalone mode don't use in-memory storage therefore we don't need mysql
* Provide Apollo dynamic configuration center implementation. fixes #2825