Add single function that kicks off all HIFLD Grid building

[danielolsen]

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• Is your feature request essential for your project?

Describe the workflow you want to enable

I wish there was a single user-facing function that could orchestrate all lower-level functions to build HIFLD grid data.

Describe your proposed implementation

The functions inputs should only be pass-throughs to lower-level functions, e.g. the higher-level functions within prereise.gather.griddata.hiflddata.data_process.

[danielolsen]

I've got a draft design in this branch: https://github.com/Breakthrough-Energy/PreREISE/tree/daniel/hifld_top_level. The high-level idea is that the user can import and call this one function, with the only argument being the location to write the outputs, and this function orchestrates:

• Processing raw inputs, via the highest-level function in each relevant sub-module of prereise.gather.griddata.hifld.data_process
• Separating dataframes to match the PowerSimData CSV schema
• Filling in columns with default/dummy values
• Writing/copying files as appropriate

[danielolsen]

Closed via #236.