Spark: Add the HBase connector to the image

[siegfriedweber]

Add the Apache HBase™ Spark Connector to the image, so that Spark applications can access HBase.

The connector must be compiled for a specific HBase version. It must be tested, if choosing the current LTS version (2.4.18) also works with the other supported versions, i.e. 2.6.0.

• feat(spark-k8s): Add the Spark HBase connector #878
• fix: Spark HBase connector on aarch64 #882
• test: HBase connector spark-k8s-operator#471

[lfrancke]

Do we have docs for this? If so, could you link to them? And could you include a snippet that we can use in the release notes?