Add Hampel outlier filter for noisy powermeter sources (#334) #654

Job	Run time
lint	16s
validate (3.10)	38s
validate (3.13)	39s
validate (3.11)	47s
validate (3.12)	44s
build-addon (linux/arm64, addon-linux-arm64) / build	40s
build (linux/arm64, base-linux-arm64) / build	57s
build-addon (linux/amd64, addon-linux-amd64) / build	43s
build (linux/amd64, base-linux-amd64) / build	47s
build (linux/arm/v7, base-linux-arm-v7) / build	32s
merge-addon / merge	24s
merge / merge	12s
	7m 19s

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