Use protobufs for packed message data #256

Job	Run time
Gradle Build	59s
PhotonClient Build	46s
Build Examples	2m 12s
Build Offline Docs	52s
Photonlib - Build Docker - Athena	4m 35s
Photonlib - Build Host - Win64	4m 39s
Photonlib - Build Docker - Raspbian	2m 14s
Photonlib - Build Host - macOS	4m 19s
Photonlib - Build Docker - Aarch64	2m 15s
Photonlib - Build Host - Linux	2m 43s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	25m 34s

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