feat(firmware): INA219 + voltage-divider auto-detect, power telemetry #2

Job	Run time
build (receiver-c3, firmware/receiver-c3, esp32c3, tanksync_receiver.bin)	2m 24s
build (transmitter, firmware/transmitter, esp32c3, tanksync_transmitter.bin)	2m 16s
build (receiver, firmware/receiver, esp32, tanksync_receiver.bin)	2m 24s
release	10s
	7m 14s

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