Optimize project build

[ruanwenjun]

I find there is a lot of warning when we build/package our project. And this waring way come form the maven-shade-plugin plugin.
To my knowledge, we should only need to use this maven-shade-plugin in the connectors module and seatunnel-core-flink/seatunnel-core-spark/seatunnel-core-sql module.

And there are some other plugins e.g. scala-checkstyle,scala-test, these plugin are also don't need to apply as all module, maybe we can extract a scala module to manage the scala dependency.

In other modules, we can remove this plugin. This may improve our build, but need to test.