Add `get_energy_prices` service call

[TheFes]

Is your feature request related to a problem? Please describe. I am the author of the cheapest_energy_hours macro which can be used to determine eg the best time to turn on your dishwasher. However, if you want to turn it on overnight, you loose today's data at midnight (as it will become yesterdays data then).

Some core integrations, like easyEnergy provide a service call in which you can get the data for the period you want, including historical data.

Describe the solution you'd like Add support for the service call mentioned above

Describe alternatives you've considered Add an additional attribute with the data of yesterday.

Additional context NA