Consider publishing .jars to Maven

Spark has a feature allowing to automatically download packages from MavenCentral/SonatypeOSS repo:
```python
spark = SparkSession.builder.config("spark.jars.packages", "com.mygroup:artifact:version").getOrCreate()
```
It is very convenient to use, as there is no need to directly access Github API to download .jar file. Instead user may just set artifact name, and it will be downloaded automatically (with private repos support).

Please consider uploading releases to MavenCentral/SonatypeOSS.

Start by reviewing how this project currently publishes release JAR files, then compare that process with MavenCentral/SonatypeOSS requirements. Confirm that the released artifacts can be consumed through Spark's spark.jars.packages setting; done means releases are available from the requested repository with the needed coordinates and documented usage.

Written by the indexing model from the issue text.