* feat(ElecPriceEnergyCharts): Add new electricity price provider: Energy-Charts
* feat(ElecPriceEnergyCharts): update data only if needed
* test(elecpriceforecast): add test for energycharts
* docs(predictions.md): add ElecPriceEnergyCharts Provider
Signed-off-by: redmoon2711 <redmoon2711@gmx.de>