[Stable]v1.5.6

What's Changed

• [project rename] changed start-waterdrop.sh to start-seatunnel.sh, changed logo ascii code from waterdrop to seatunnel by @garyelephant
• [Feature] added the abstraction of BaseAction by @garyelephant in #810
• [feature] allow user to customize log4j.properties @garyelephant in #267 (comment)
• [bugfix] fixed a bug of kerberos config in spark config by @garyelephant in #590
• [bugfix] Fix bug of #719 by @RickyHuo in #743