Add support for DC Electrical Measurement

[P-R-O-C-H-Y]

This PR adds support for DC measurements of the ElectricalMeasurement cluster. Only AC is supported now.

I have tested using a local home assistant with the changes implemented, all works fine. Values are in correct resolution.

However, I am receiving warnings in the log:

2025-05-19 15:15:13.160 WARNING (MainThread) [homeassistant.components.zha.sensor] Unexpected extra state attributes found for sensor <zha.application.platforms.sensor.ElectricalMeasurementDCVoltage object at 0x1343196a0>: {'dc_voltage_max'}
2025-05-19 15:15:13.160 WARNING (MainThread) [homeassistant.components.zha.sensor] Unexpected extra state attributes found for sensor <zha.application.platforms.sensor.ElectricalMeasurementDCCurrent object at 0x1343197f0>: {'dc_current_max'}
2025-05-19 15:15:13.160 WARNING (MainThread) [homeassistant.components.zha.sensor] Unexpected extra state attributes found for sensor <zha.application.platforms.sensor.ElectricalMeasurementDCPower object at 0x134319940>: {'dc_power_max'}

@puddly Can you please take a look?

Diagnostics file:
zha-01JTN6EVKS6CN88NJXBJPG000P-Espressif ZigbeeElectricalMeasurementDC-c4599a43a5e2d4ab879b05282130e645.json

[TheJulianJES]

BaseElectricalMeasurement sets _attr_extra_state_attribute_names. Since HA Core generally doesn't want us to add new extra state attributes, we're expecting existing ones here: https://github.com/home-assistant/core/blob/760f2d1959880abc436c4d8a5e0b0903f06fbace/homeassistant/components/zha/sensor.py#L33-L77

The DC attributes aren't included, so that's why you're seeing the warnings about them being unexpected.
Tbh, I think we should just remove these _max extra state attributes for all EM sensors.
For now, maybe we can add an attribute to BaseElectricalMeasurement that allows us to turn off the extra state attributes per sensor entity class. For now, we would only do that for the new DC entities then.

[puddly]

Tbh, I think we should just remove these _max extra state attributes for all EM sensors.

Agreed. I think pretty much all current uses of extra state attributes should be new entities. Or removed entirely.

[P-R-O-C-H-Y]

Thanks for taking a look. Should I work on that or if you know exactly what you want to do can you take over? :)

[P-R-O-C-H-Y]

@puddly Anything I can do here to move on with this PR?

[lboue]

@puddly Anything I can do here to move on with this PR?

You should add tests here to fix CI tests

zha/tests/test_sensor.py

Lines 570 to 576 in a2de928

	(
	homeautomation.ElectricalMeasurement.cluster_id,
	sensor.ElectricalMeasurementRMSCurrent,
	partial(async_test_em_rms_current, 0x0508, 0x050A, "rms_current_max"),
	{"ac_current_divisor": 1000, "ac_current_multiplier": 1},
	{"active_power", "apparent_power", "rms_voltage"},
	),

zha/tests/test_cluster_handlers.py

Lines 287 to 308 in a2de928

	{
	"ac_frequency",
	"ac_voltage_divisor",
	"ac_current_divisor",
	"ac_power_divisor",
	"ac_voltage_multiplier",
	"ac_power_multiplier",
	"power_divisor",
	"power_multiplier",
	"ac_current_multiplier",
	"ac_frequency",
	"active_power",
	"active_power_ph_b",
	"active_power_ph_c",
	"apparent_power",
	"rms_current",
	"rms_current_ph_b",
	"rms_current_ph_c",
	"rms_voltage",
	"rms_voltage_ph_b",
	"rms_voltage_ph_c",
	},

[P-R-O-C-H-Y]

@TheJulianJES @puddly @lboue Can you please help with resolving the failures in the tests? I tried locally without any positive results.