Refactor EMA smoothing into composable powermeter wrappers #643

Job	Run time
lint	14s
validate (3.10)	40s
validate (3.13)	37s
validate (3.11)	41s
validate (3.12)	43s
build-addon (linux/amd64, addon-linux-amd64) / build	34s
build-addon (linux/arm64, addon-linux-arm64) / build	33s
build (linux/amd64, base-linux-amd64) / build	26s
build (linux/arm/v7, base-linux-arm-v7) / build	42s
build (linux/arm64, base-linux-arm64) / build	42s
merge-addon / merge	15s
merge / merge	19s
	6m 26s

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