Revise UML diagram of sources

[ckittl]

Currently, there are two UML diagrams regarding data sources out there. While both feel not to be comprehensive, especially the file DataSourceClassDiagram_draft.puml raises some questions.

• Is this still a valid draft?
• Which parts have yet been completed?

PowerSystemDataModel/docs/uml/main/DataSourceClassDiagram_draft.puml

Lines 96 to 107 in dbacf9e

	Class InputAccumulator {
	+ InputAccumulator InputAccumulator(SimulationModelConfig)
	+ Future<SimulationModel> importSimulationModel()
	+ SimulationModel getSimulationModel()
	}
	InputAccumulator --> GridDataSource
	InputAccumulator --> AssetDataSource
	InputAccumulator --> TypeDataSource
	InputAccumulator --> GraphicDataSource
	InputAccumulator --> WeatherDataSource
	InputAccumulator --> WholesaleDataSource
	InputAccumulator --> SimulationModel

Please check and put everything, that has been done yet into DataSourceClassDiagram.puml. For any doubts, please search for discussion.