Updated preprocessing steps

[JavierACM]

Updates:

• Condensed read data functions into one.
• Updated test_data_ingestion.py to reflect changes.
• Created EDA folder.
• Moved eda_report.py.
• Deleted EDA HTML reports.

Future work:

• Replace eda_report.py with Jupyter notebook.
• Display EDA report within above-mentioned notebook.
• Read ERCOT market data.
• Create raw data ERD.

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[JavierACM]

• Added type hints to data_ingestion functions
• Added FileNotFoundError exception handling
• Changed naming for datasets
• Converted test_data_ingestion file into Jupyter Notebook