Add reading Consumption values from SE WYE (4-wire) Meter

[kostasyrtariotis]

In the Sunspec doc here at page19 the address 40155 handles Export + Import, Production and Consumption, even though there are no related values.

[erikarenhill]

In the Sunspec doc here at page19 the address 40155 handles Export + Import, Production and Consumption, even though there are no related values.

Since I don't have a smart meter myself this will require help from someone that has one to verify that it works.

[marpi82]

Inside 40155 register is stored meter function which is set up at FC setup menu - this is meter function (place of the meter installation)

You can read about this here:
https://www.solaredge.com/sites/default/files/solaredge-meter-installation-guide.pdf
page 29

[erikarenhill]

Feel free to submit a PR of you are able to test it, even if there is documentation for it I prefer tested code before adding it.