Run mvn spotless:apply with pre-commit so that it runs on git commit

[jbampton]

As an extra check it would be good to add mvn spotless:apply to pre-commit so that it runs on git commit

Seems both Java and Scala are not listed as supported languages for pre-commit but they do have:

• docker
• docker_image
• script
• system

"System hooks provide a way to write hooks for system-level executables which don't have a supported language above (or have special environment requirements that don't allow them to run in isolation such as pylint).

This hook type will not be given a virtual environment to work with – if it needs additional dependencies the consumer must install them manually.

Support: the support of system hooks depend on the executables."

https://pre-commit.com/#supported-languages

I found some issues about pre-commit and spotless:

diffplug/spotless#623

diffplug/spotless#178

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