Use protobufs for packed message data #266

Job	Run time
Build Offline Docs	42s
PhotonClient Build	47s
Gradle Build	2m 15s
Build Examples	3m 1s
Photonlib - Build Docker - Athena	2m 55s
Photonlib - Build Docker - Raspbian	2m 55s
Photonlib - Build Host - Win64	8m 33s
Photonlib - Build Docker - Aarch64	3m 5s
Photonlib - Build Host - macOS	3m 27s
Photonlib - Build Host - Linux	3m 23s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	31m 3s

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