[NFC] Reorgranize CI tasks into their own files #3

Job	Run time
Gradle Build	5m 14s
Build Examples	3m 29s
PhotonClient Build	55s
Build Offline Docs	1m 2s
Photonlib - Build Host - Win64	8m 47s
Photonlib - Build Docker - Athena	4m 55s
Photonlib - Build Docker - Raspbian	8m 48s
Photonlib - Build Host - Linux	4m 56s
Photonlib - Build Docker - Aarch64	11m 51s
Build fat JAR - Win64	2m 58s
Build fat JAR - macOS	2m 37s
Build fat JAR - Linux	2m 22s
Build fat JAR - macOSArm	2m 29s
Build fat JAR - LinuxArm32	2m 26s
Build fat JAR - LinuxArm64	2m 26s
Build image - ${{ matrix.image_url }}	0s
release	0s
	1h 5m 15s

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