Move `java/preprocessor` to Gradle #32

Job	Run time
Create Pull Request Build for linux (aarch64)	4m 57s
Create Pull Request Build for linux (x64)	3m 7s
Create Pull Request Build for windows (x64)	8m 29s
Create Pull Request Build for macos (x64)	7m 48s
Create Pull Request Build for macos (aarch64)	3m 8s
	27m 29s

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