Integration of hdf/parquet loadshapes

### Feature Request

Following up on the sourceforce discussion here:
https://sourceforge.net/p/electricdss/discussion/861976/thread/59230a2c2d/

This is regarding the support of reading loadshape information in hdf/parquet format for the dss-extensions suite. My understanding is that existing memory allocation mechanisms (such as those here https://github.com/dss-extensions/dss_capi/blob/master/src/CAPI/CAPI_LoadShapes.pas#L453) could be leveraged to stream data from hdf and parquet files and that there is already some existing code which can be backported to support this.

I'd be very supportive of any efforts to integrate this workflow into opendssdirect.py and opendssdirect.jl

Furthermore let me know if there is any interest in allowing for reading multiple loadshapes from a single hdf or parquet file. This could significantly improve the performance of any hdf/parquet reader.

Happy to move this issue to the dss_capi if it makes more sense for it to live there.