Move `java/preprocessor` to Gradle #287

Job	Run time
Create Pull Request Build for linux (arm)	4m 26s
Create Pull Request Build for linux (x64)	57s
Create Pull Request Build for windows (x64)	1m 52s
Create Pull Request Build for macos (x64)	2m 7s
Create Pull Request Build for macos (aarch64)	52s
Create Pull Request Build for linux (aarch64)	1m 5s
	11m 19s

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