Implement Hall D Data Prep for PunziNet

[dlersch]

Migrate the HallD data parser for the punzi network to the exp.hall repository

[dlersch]

• Implemented data preparation module for PunziNet analysis
• The preparation modules is based on this core class
• The module add physics observables to an existing pandas data frame
• The observables are based on the luminosity and decay rates, provided by the user
• Wrote unit-test that loads (a small!) sample data frame and applies the data preparation module to it
• This preparation module has NO reverse function, as the applied operations are irreversible
• Shown below is a plot produced by the unit-test that just shows one observable ("weight") that has been added to the dataframe