[SEDONA-559] Make the flink example work

[docete]

The sedona examples project is not managed by parent pom file.
It should be a submodule of the parent project and the flink example should work in IDE.
This PR fix this.

What changes were proposed in this PR?

• b24e17d enable scalastyle config
• 84ae117 make the flink example work

How was this patch tested?

[jiayuasu]

@docete Sorry, the example projects are not included in the parent pom on purpose. They are not considered as source code of Sedona. They are templates for people to develop their own applications.

[docete]

@jiayuasu IMO it should be included in the parent pom if it is placed in the same repo. Otherwise, it will not be well maintained. BTW, we should implement our use cases as the formal demonstration. What do you think?

[jiayuasu]

The purpose of the example projects is to demo that you can build applications on top of the released version of Sedona. This is also useful for us to discover dependency bugs which cannot be discovered when bundled together with the parent pom.

We also have CI/CD to test the correctness of the example projects.

[docete]

OK, I will unbundle the example projects and fix the build/run issues.

[docete]

Check the ci/cd issues
[INFO] ------------------------------------------------------------------------ Error: Unable to access jarfile target/sedona-spark-example-1.0.0.jar Error: Process completed with exit code 1.
Should we keep the example version and the sedona version consistent?

[jiayuasu]

We could but we don't have to. What is your preference?

[docete]

Let it consistent with SEDONA parent to keep it up to date with every release.

[jiayuasu]

sounds good!

[docete]

updated the github ci/cd script.