feat: add device group subscription #16

Job	Run time
docker-build / Build Docker image	59s
warmup-cache / warmup-cache	27s
codeql / Analyze (javascript)	1m 17s
types / check-types	36s
linting / check-linting	26s
translations / check-translations	24s
formatter / check-format	27s
build / build	42s
coverage / coverage-test	53s
	6m 11s

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