Add scripts for importing prices and sale contract fees; update purchase fees script

- Implemented `import_prices.py` to import price index values from a CSV file with migration mapping.
- Created `import_sale_fees.py` for importing sale contract line fees, including detailed logging and error handling.
- Modified `import_purchase_fees.py` to change fee type from 'ordered' to 'budgeted' and added fee ID logging.

Reference Data/python_project/loaders/Prices_4.csv

@@ -0,0 +1,53 @@
+price_index,price_date,high_price,low_price,open_price,price_value
+CFR Chile 2025-04,2024-04-05,123,123,123,123
+CFR Chile 2025-04,2024-04-12,123,123,123,123
+CFR Chile 2025-04,2024-04-19,123,123,123,123
+CFR Chile 2025-04,2024-04-26,123,123,123,123
+CFR Chile 2025-04,2024-05-03,123,123,123,123
+CFR Chile 2025-04,2024-05-10,123,123,123,123
+CFR Chile 2025-04,2024-05-16,123,123,123,123
+CFR Chile 2025-04,2024-05-24,123,123,123,123
+CFR Chile 2025-04,2024-05-31,123,123,123,123
+CFR Chile 2025-04,2024-06-07,123,123,123,123
+CFR Chile 2025-04,2024-06-14,126,126,126,126
+CFR Chile 2025-04,2024-06-21,130,130,130,130
+CFR Chile 2025-04,2024-06-28,130,130,130,130
+CFR Chile 2025-04,2024-07-05,130,130,130,130
+CFR Chile 2025-04,2024-07-12,130,130,130,130
+CFR Chile 2025-04,2024-07-19,140,140,140,140
+CFR Chile 2025-04,2024-07-23,140,140,140,140
+CFR Chile 2025-04,2024-07-26,147,147,147,147
+CFR Chile 2025-04,2024-08-02,147,147,147,147
+CFR Chile 2025-04,2024-08-09,149,149,149,149
+CFR Chile 2025-04,2024-08-16,150,150,150,150
+CFR Chile 2025-04,2024-08-23,153,153,153,153
+CFR Chile 2025-04,2024-08-30,153,153,153,153
+CFR Chile 2025-04,2024-09-06,153,153,153,153
+CFR Chile 2025-04,2024-09-13,153,153,153,153
+CFR Chile 2025-04,2024-09-20,157,157,157,157
+CFR Chile 2025-04,2024-09-27,159,159,159,159
+CFR Chile 2025-04,2024-10-04,161,161,161,161
+CFR Chile 2025-04,2024-10-11,161,161,161,161
+CFR Chile 2025-04,2024-10-18,162,162,162,162
+CFR Chile 2025-04,2024-10-25,162,162,162,162
+CFR Chile 2025-04,2024-11-01,160,160,160,160
+CFR Chile 2025-04,2024-11-08,154,154,154,154
+CFR Chile 2025-04,2024-11-15,151,151,151,151
+CFR Chile 2025-04,2024-11-22,151,151,151,151
+CFR Chile 2025-04,2024-11-29,151,151,151,151
+CFR Chile 2025-04,2024-12-06,152,152,152,152
+CFR Chile 2025-04,2024-12-13,151,151,151,151
+CFR Chile 2025-04,2024-12-20,150,150,150,150
+CFR Chile 2025-04,2025-01-10,149,149,149,149
+CFR Chile 2025-04,2025-01-17,150,150,150,150
+CFR Chile 2025-04,2025-01-24,150,150,150,150
+CFR Chile 2025-04,2025-01-31,149,149,149,149
+CFR Chile 2025-04,2025-02-03,149,149,149,149
+CFR Chile 2025-04,2025-02-07,145,145,145,145
+CFR Chile 2025-04,2025-02-14,144,144,144,144
+CFR Chile 2025-04,2025-02-21,144,144,144,144
+CFR Chile 2025-04,2025-02-28,142,142,142,142
+CFR Chile 2025-04,2025-03-07,142,142,142,142
+CFR Chile 2025-04,2025-03-14,145,145,145,145
+CFR Chile 2025-04,2025-03-21,150,150,150,150
+CFR Chile 2025-04,2025-03-28,160,160,160,160