Adjust API endpoints to paper

[marvin-steinke]

The current API endpoints are not consistent with the endpoints defined in Philipps paper and need to be adjusted according to:

Request Method	Endpoint	Request Body	Description
GET	/solar	-	Gets the current solar power production in W.
GET	/ci	-	Gets the current grid carbon intensity in gCO2/kWh.
GET	/battery-soc	-	Gets the current battery state of charge in %.
GET	/forecasts/solar	-	Gets the solar forecast for the next 24 hours.
GET	/forecasts/ci	-	Gets the grid carbon intensity for the next 24 hours.
PUT	/ves/battery	{"min_soc": 0.6, "grid_charge": 10}	Configures the battery: min_soc describes the minimum state of charge in %, and grid_charge the power at which the battery is charged from the public grid in W.
PUT	/cs/nodes/{id}	{"power_mode": "normal"}	Configures the power mode of node {id} (see Table 2).

Open Questions @birnbaum :

• What is the output format of the forecasts?

[birnbaum]

Thanks Marvin! I think we should go with what electricitymaps and watttime are doing:

• https://static.electricitymaps.com/api/docs/index.html#forecasted-carbon-intensity
• https://www.watttime.org/api-documentation/#emissions-forecast

Let's follow electricitymaps' format for now (the content they return is pretty much identical anyway)

[birnbaum]

We're working on a new REST API and will not provide an implementation of the one from the journal paper