Migration of the `pdf` library to Gradle #234

Job	Run time
Test Processing	4m 1s
(linux/x64) Create Processing Build	9m 48s
(linux/aarch64) Create Processing Build	8m 14s
(windows/x64) Create Processing Build	5m 59s
(macos/x64) Create Processing Build	10m 47s
(macos/aarch64) Create Processing Build	4m 35s
	43m 24s

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