SimBench data loader

[bramstoeller]

Create a SimBenchConverter that downloads and extracts a sim bench dataset (using a download util), reads the data (using a CsvDirStore) and converts it to PGM data (using a SimBenhConverter + mapping file).

[nitbharambe]

Documentation: https://simbench.de/wp-content/uploads/2020/01/simbench_documentation_en_1.0.0.pdf
Simbench examples are dervied from a single large grid. The examples are subdivided based on applications like rural and urban. For start we can use the 1-MV-rural--0-sw grid. Or any grid with the MV and LV codes

Note:

• Unsupported Content: EHV grids (PowerPlants.csv). Note that the calc_type is pvm which means pv type. (Pg. 94 of pdf)
• No data for asymmetric calculations