[chore][fix][doc](fe-plugin)(mysqldump) fix build auditlog plugin error (#7804)

1. fix problems when build fe_plugins
2. format
3. add docs about dump data using mysql dump
4 files changed
tree: fa094a0cab0427c82960b6898a96b4487bf2ed1c
  1. DataX/
  2. flink-doris-connector/
  3. logstash/
  4. spark-doris-connector/